Whois/Registration Data Access Protocol (RDAP)
Looking for instructions on using ARIN’s Whois/RDAP search? Visit ARIN’s Whois page.
Overview
Registry Data Access Protocol (RDAP) is a Whois alternative for querying resource registration data from Domain Name Registries (DNRs) and Regional Internet Registries (RIRs) like ARIN. When you use RDAP clients to query registration data, responses are delivered in JavaScript Object Notation (JSON) format (instead of the text format provided by Whois). When you use the Search Site or Whois feature or use https://search.arin.net/rdap/ for Whois queries, RDAP responses are returned in formatted HTML.
RDAP works so that it queries additional RIRs and registrars to obtain some information. Other organizations may collect data that ARIN does not, or contain data that is named, formatted, or displayed differently than ARIN’s data. Checking the “Source Registry field” or the footer in the search results will help identify the specific RIR or registrar where the data originates and explain differences in content and format. For a full listing of possible results returned in an RDAP query, visit RFC 7483, JSON Responses for the Registration Data Access Protocol (RDAP).
How does RDAP differ from Whois?
- RDAP is an HTTP-based REST-style protocol with standardized responses specified in JSON, whereas Whois is a text based protocol, utilizing a specialized protocol and port. RDAP meets the industry-accepted definition for a web-based RESTful protocol. It serves JSON responses over HTTP/HTTPS using URLs to distinguish various resources. The only HTTP methods used by RDAP are
HEADandGET. - RDAP response data objects are easily translated into languages other than English, whereas Whois response data objects may not be.
- RDAP responses offer direct referrals to other RIRs, whereas Whois defines no queries or responses, and interaction with DNRs and RIRs can vary significantly.
Understanding Bootstrapping
A bootstrap server is a special type of server for helping clients find an authoritative server to query (this is called bootstrapping). Query bootstrapping can be an expensive process for some clients, and a bootstrap server can alleviate that expense by pre-loading the bootstrapping information. To utilize an RDAP bootstrap server, an RDAP client simply sends RDAP queries and receives HTTP redirects to the authoritative server.
Bootstrap files are JSON files specified in RFC 7484. The Internet Assigned Numbers Authority (IANA) publishes the following files:
- Autonomous System Numbers
- IPv4 Allocations
- IPv6 Allocations
- Domain Registries
If you use the correct query URL in your RDAP query, ARIN’s bootstrap server automatically sends the queries to the correct server.
Operating Your Own Bootstrap Server
The ARIN bootstrap server is open source and can be found on GitHub.
How to Get Registration Information Using RDAP
You can use RDAP to get registration information from ARIN using the following methods:
Using the Whois/RDAP Web Interface
You can access the Whois/RDAP web interface by choosing one of these options:
- Enter https://search.arin.net/rdap/ into the address bar of your web browser. After reaching the ARIN Whois/RDAP page, enter your search term in the field and choose Search.
- Enter the item you want to search Whois for into the search box (labeled Search Site or Whois). ARIN sends this query to
search.arin.net, and returns results based on what type of search it guesses you were trying to perform. For example, if the search engine thinks you are searching for information about subject areas on the web site (for example, policy, services, or ARIN functions), it returns results fromwww.arin.net(you can then choose the Search ARIN’s Whois instead link on the results page). If you enter a search term that has a specific format, such as an IP address (for example,2001:500:11::) or an Autonomous System Number (ASN) (for example,AS64496), the search engine automatically queries Whois/RDAP.
For more information on using the Whois/RDAP web interface, visit the Whois page.
Using an RDAP Client
ARIN has written a command-line RDAP client called NicInfo.
In addition, there are clients available from DNSBelgium, CNNIC, and CentralNIC.
RDAP queries are entered with a specific structure. The following examples use the NicInfo client.
NicInfo Query Structure
The parts of an RDAP query are comprised of the object you are querying and the bootstrap server (optional). For example, to query an object using ARIN’s bootstrap server, you would enter the command:
nicinfo <object> --base http://rdap-bootstrap.arin.net/bootstrap/
where <object> is an IP address, domain name, ASN, or entity identifier.
To query an object without using ARIN’s bootstrap server, you would enter:
nicinfo <object> --base http://rdap-bootstrap.arin.net/registry/
where <object> is an IP address, domain name, ASN, or entity identifier.
For a specific example, to query an ASN of AS64496, you would enter the following query (using bootstrap):
nicinfo <asn> --base http://rdap-bootstrap.arin.net/bootstrap
The returned response for a query for AS64496 might look like the following example.
Sample Output
computer:~ user$ nicinfo AS64496 --base http://rdap-bootstrap.arin.net/bootstrap/
# NicInfo v.1.4.1
# Result type is ASNUMBER.
[ RESPONSE DATA ]
1= AS64496
`--- 1= Internet Assigned Numbers Authority ( IANA )
|--- 1= Internet Corporation for Assigned Names and Number ( IANA-ARIN )
`--- 2= ICANN ( IANA-IP-ARIN )
[ AS NUMBER ]
Handle: AS64496
Start AS Number: 64496
End AS Number: 64511
Last Changed: Wed, 14 Jan 2009 18:10:12 -0500
Registration: Wed, 03 Dec 2008 00:00:00 -0500
Remarks: -- Registration Comments --
1: Reserved for use in documentation and sample code [RFC5398]
[ ENTITY ]
Handle: IANA
Common Name: Internet Assigned Numbers Authority
Roles: Registrant
Last Changed: Fri, 31 Aug 2012 13:32:25 -0400Using Query URLs
You can create RDAP queries with a URL structure that can be used with command-line tools like cURL, or included in scripts written in languages like Ruby or perl.
Query URLs have the following structure:
<rdap-url><object>/<search-item>
where <rdap-url> is the registration information provider’s RDAP server URL (in this case, ARIN’s RDAP URL) and <object> is an IP address, domain name, ASN, or entity identifier. The following sections provide examples of RDAP queries.
IP Networks
Queries for information about IP networks are of the form:
<rdap-url>/ip/<search-term> or /ip/<address>/<prefix>
where the path segment following ip is either an IPv4 dotted decimal or IPv6 [RFC5952] address (i.e., 2001:500:11::) or an IPv4 or IPv6 Classless Inter-domain Routing (CIDR) [RFC4632] notation address block (i.e., 12.0.0.0/8).
Query Example:
https://rdap-bootstrap.arin.net/bootstrap/ip/149.112.152.0/22
Sample Output:
{
"rdapConformance" : [ "nro_rdap_profile_0", "rdap_level_0", "cidr0", "arin_originas0" ],
"notices" : [ {
"title" : "Terms of Service",
"description" : [ "By using the ARIN RDAP/Whois service, you are agreeing to the RDAP/Whois Terms of Use" ],
"links" : [ {
"value" : "https://rdap.arin.net/registry/ip/149.112.152.0/22",
"rel" : "terms-of-service",
"type" : "text/html",
"href" : "https://www.arin.net/resources/registry/whois/tou/"
} ]
}, {
"title" : "Whois Inaccuracy Reporting",
"description" : [ "If you see inaccuracies in the results, please visit: " ],
"links" : [ {
"value" : "https://rdap.arin.net/registry/ip/149.112.152.0/22",
"rel" : "inaccuracy-report",
"type" : "text/html",
"href" : "https://www.arin.net/resources/registry/whois/inaccuracy_reporting/"
} ]
}, {
"title" : "Copyright Notice",
"description" : [ "Copyright 1997-2021, American Registry for Internet Numbers, Ltd." ]
} ],
"handle" : "NET-149-112-152-0-1",
"startAddress" : "149.112.152.0",
"endAddress" : "149.112.155.255",
"ipVersion" : "v4",
"name" : "RS-RND",
"type" : "DIRECT ASSIGNMENT",
"parentHandle" : "NET-149-0-0-0-0",
"events" : [ {
"eventAction" : "last changed",
"eventDate" : "2021-10-21T17:03:32-04:00"
}, {
"eventAction" : "registration",
"eventDate" : "2021-08-20T11:13:48-04:00"
} ],
"links" : [ {
"value" : "https://rdap.arin.net/registry/ip/149.112.152.0/22",
"rel" : "self",
"type" : "application/rdap+json",
"href" : "https://rdap.arin.net/registry/ip/149.112.152.0"
}, {
"value" : "https://rdap.arin.net/registry/ip/149.112.152.0/22",
"rel" : "alternate",
"type" : "application/xml",
"href" : "https://whois.arin.net/rest/net/NET-149-112-152-0-1"
} ],
"entities" : [ {
"handle" : "ARINL",
"vcardArray" : [ "vcard", [ [ "version", { }, "text", "4.0" ], [ "fn", { }, "text", "ARIN Routing Security" ], [ "adr", {
"label" : "PO Box 232290\nCentreville\nVA\n20120\nUnited States"
}, "text", [ "", "", "", "", "", "", "" ] ], [ "kind", { }, "text", "org" ] ] ],
"roles" : [ "registrant" ],
"links" : [ {
"value" : "https://rdap.arin.net/registry/ip/149.112.152.0/22",
"rel" : "self",
"type" : "application/rdap+json",
"href" : "https://rdap.arin.net/registry/entity/ARINL"
}, {
"value" : "https://rdap.arin.net/registry/ip/149.112.152.0/22",
"rel" : "alternate",
"type" : "application/xml",
"href" : "https://whois.arin.net/rest/org/ARINL"
} ],
"events" : [ {
"eventAction" : "last changed",
"eventDate" : "2021-10-21T17:04:25-04:00"
}, {
"eventAction" : "registration",
"eventDate" : "2021-08-17T07:05:54-04:00"
} ],
"entities" : [ {
"handle" : "GORMA154-ARIN",
"vcardArray" : [ "vcard", [ [ "version", { }, "text", "4.0" ], [ "adr", {
"label" : "PO Box 232290\nCentreville\nVA\n20120\nUnited States"
}, "text", [ "", "", "", "", "", "", "" ] ], [ "fn", { }, "text", "Brad Gorman" ], [ "n", { }, "text", [ "Gorman", "Brad", "", "", "" ] ], [ "kind", { }, "text", "individual" ], [ "email", { }, "text", "bgorman@arin.net" ], [ "tel", {
"type" : [ "work", "voice" ]
}, "text", "+1-703-555-1212" ] ] ],
"roles" : [ "technical", "dns", "routing", "administrative", "abuse" ],
"links" : [ {
"value" : "https://rdap.arin.net/registry/ip/149.112.152.0/22",
"rel" : "self",
"type" : "application/rdap+json",
"href" : "https://rdap.arin.net/registry/entity/GORMA154-ARIN"
}, {
"value" : "https://rdap.arin.net/registry/ip/149.112.152.0/22",
"rel" : "alternate",
"type" : "application/xml",
"href" : "https://whois.arin.net/rest/poc/GORMA154-ARIN"
} ],
"events" : [ {
"eventAction" : "last changed",
"eventDate" : "2021-08-16T17:17:09-04:00"
}, {
"eventAction" : "registration",
"eventDate" : "2021-08-16T16:57:10-04:00"
} ],
"status" : [ "validated" ],
"port43" : "whois.arin.net",
"objectClassName" : "entity"
} ],
"port43" : "whois.arin.net",
"objectClassName" : "entity"
} ],
"port43" : "whois.arin.net",
"status" : [ "active" ],
"objectClassName" : "ip network",
"cidr0_cidrs" : [ {
"v4prefix" : "149.112.152.0",
"length" : 22
} ],
"arin_originas0_originautnums" : [ ]
}Domains
This query searches for forward domain name or reverse domain information that matches the search term you enter. Since ARIN’s registry does not contain forward domain information, if you are searching for forward domains, your query will return results from a domain registrar (for example, Verisign), and the source of the results will be indicated in the results. Some registrars will not provide information for all fields in the result; for example, if the registrar does not collect that particular data, or if privacy laws prevent the registrar from sharing that data.
Reverse domain information (also called an “inverse address domain”) includes the “in-addr.arpa” or “ip6.arpa” domain name that is used in reverse DNS. Reverse domain information, along with pointer (PTR) records, is used to find the domain name associated with an IP address. If you are searching for the reverse domain associated with an IP address (for example, 0.43.199.in-addr.arpa that is associated with 199.43.0.0), the information will come from ARIN or the RIR where the reverse DNS is configured.
Queries for domain information are of the form:
<rdap-url>/domain/<domain>
where <rdap-url> is the registration information provider’s RDAP server URL (in this case, ARIN’s RDAP URL) and domain is the forward domain, in-addr.arpa, or ip6.arpa domain.
Query Example:
https://rdap.arin.net/registry/domain/152.112.149.in-addr.arpa.
Sample Output:
{
"rdapConformance" : [ "nro_rdap_profile_0", "rdap_level_0" ],
"notices" : [ {
"title" : "Terms of Service",
"description" : [ "By using the ARIN RDAP/Whois service, you are agreeing to the RDAP/Whois Terms of Use" ],
"links" : [ {
"value" : "https://rdap.arin.net/registry/domain/152.112.149.in-addr.arpa.",
"rel" : "terms-of-service",
"type" : "text/html",
"href" : "https://www.arin.net/resources/registry/whois/tou/"
} ]
}, {
"title" : "Whois Inaccuracy Reporting",
"description" : [ "If you see inaccuracies in the results, please visit: " ],
"links" : [ {
"value" : "https://rdap.arin.net/registry/domain/152.112.149.in-addr.arpa.",
"rel" : "inaccuracy-report",
"type" : "text/html",
"href" : "https://www.arin.net/resources/registry/whois/inaccuracy_reporting/"
} ]
}, {
"title" : "Copyright Notice",
"description" : [ "Copyright 1997-2021, American Registry for Internet Numbers, Ltd." ]
} ],
"handle" : "152.112.149.in-addr.arpa.",
"ldhName" : "152.112.149.in-addr.arpa.",
"events" : [ {
"eventAction" : "last changed",
"eventDate" : "2021-08-20T11:14:33-04:00"
} ],
"links" : [ {
"value" : "https://rdap.arin.net/registry/domain/152.112.149.in-addr.arpa.",
"rel" : "self",
"type" : "application/rdap+json",
"href" : "https://rdap.arin.net/registry/domain/152.112.149.in-addr.arpa."
}, {
"value" : "https://rdap.arin.net/registry/domain/152.112.149.in-addr.arpa.",
"rel" : "alternate",
"type" : "application/xml",
"href" : "https://whois.arin.net/rest/rdns/152.112.149.in-addr.arpa."
} ],
"entities" : [ {
"handle" : "ARINL",
"vcardArray" : [ "vcard", [ [ "version", { }, "text", "4.0" ], [ "fn", { }, "text", "ARIN Routing Security" ], [ "adr", {
"label" : "PO Box 232290\nCentreville\nVA\n20120\nUnited States"
}, "text", [ "", "", "", "", "", "", "" ] ], [ "kind", { }, "text", "org" ] ] ],
"roles" : [ "registrant" ],
"links" : [ {
"value" : "https://rdap.arin.net/registry/domain/152.112.149.in-addr.arpa.",
"rel" : "self",
"type" : "application/rdap+json",
"href" : "https://rdap.arin.net/registry/entity/ARINL"
}, {
"value" : "https://rdap.arin.net/registry/domain/152.112.149.in-addr.arpa.",
"rel" : "alternate",
"type" : "application/xml",
"href" : "https://whois.arin.net/rest/org/ARINL"
} ],
"events" : [ {
"eventAction" : "last changed",
"eventDate" : "2021-10-21T17:04:25-04:00"
}, {
"eventAction" : "registration",
"eventDate" : "2021-08-17T07:05:54-04:00"
} ],
"entities" : [ {
"handle" : "GORMA154-ARIN",
"vcardArray" : [ "vcard", [ [ "version", { }, "text", "4.0" ], [ "adr", {
"label" : "PO Box 232290\nCentreville\nVA\n20120\nUnited States"
}, "text", [ "", "", "", "", "", "", "" ] ], [ "fn", { }, "text", "Brad Gorman" ], [ "n", { }, "text", [ "Gorman", "Brad", "", "", "" ] ], [ "kind", { }, "text", "individual" ], [ "email", { }, "text", "bgorman@arin.net" ], [ "tel", {
"type" : [ "work", "voice" ]
}, "text", "+1-703-555-1212" ] ] ],
"roles" : [ "technical", "dns", "routing", "administrative", "abuse" ],
"links" : [ {
"value" : "https://rdap.arin.net/registry/domain/152.112.149.in-addr.arpa.",
"rel" : "self",
"type" : "application/rdap+json",
"href" : "https://rdap.arin.net/registry/entity/GORMA154-ARIN"
}, {
"value" : "https://rdap.arin.net/registry/domain/152.112.149.in-addr.arpa.",
"rel" : "alternate",
"type" : "application/xml",
"href" : "https://whois.arin.net/rest/poc/GORMA154-ARIN"
} ],
"events" : [ {
"eventAction" : "last changed",
"eventDate" : "2021-08-16T17:17:09-04:00"
}, {
"eventAction" : "registration",
"eventDate" : "2021-08-16T16:57:10-04:00"
} ],
"status" : [ "validated" ],
"port43" : "whois.arin.net",
"objectClassName" : "entity"
} ],
"port43" : "whois.arin.net",
"objectClassName" : "entity"
} ],
"port43" : "whois.arin.net",
"network" : {
"handle" : "NET-149-112-152-0-1",
"startAddress" : "149.112.152.0",
"endAddress" : "149.112.155.255",
"ipVersion" : "v4",
"name" : "RS-RND",
"type" : "DIRECT ASSIGNMENT",
"parentHandle" : "NET-149-0-0-0-0",
"events" : [ {
"eventAction" : "last changed",
"eventDate" : "2021-10-21T17:03:32-04:00"
}, {
"eventAction" : "registration",
"eventDate" : "2021-08-20T11:13:48-04:00"
} ],
"links" : [ {
"value" : "https://rdap.arin.net/registry/domain/152.112.149.in-addr.arpa.",
"rel" : "self",
"type" : "application/rdap+json",
"href" : "https://rdap.arin.net/registry/ip/149.112.152.0"
}, {
"value" : "https://rdap.arin.net/registry/domain/152.112.149.in-addr.arpa.",
"rel" : "alternate",
"type" : "application/xml",
"href" : "https://whois.arin.net/rest/net/NET-149-112-152-0-1"
} ],
"entities" : [ {
"handle" : "ARINL",
"vcardArray" : [ "vcard", [ [ "version", { }, "text", "4.0" ], [ "fn", { }, "text", "ARIN Routing Security" ], [ "adr", {
"label" : "PO Box 232290\nCentreville\nVA\n20120\nUnited States"
}, "text", [ "", "", "", "", "", "", "" ] ], [ "kind", { }, "text", "org" ] ] ],
"roles" : [ "registrant" ],
"links" : [ {
"value" : "https://rdap.arin.net/registry/domain/152.112.149.in-addr.arpa.",
"rel" : "self",
"type" : "application/rdap+json",
"href" : "https://rdap.arin.net/registry/entity/ARINL"
}, {
"value" : "https://rdap.arin.net/registry/domain/152.112.149.in-addr.arpa.",
"rel" : "alternate",
"type" : "application/xml",
"href" : "https://whois.arin.net/rest/org/ARINL"
} ],
"events" : [ {
"eventAction" : "last changed",
"eventDate" : "2021-10-21T17:04:25-04:00"
}, {
"eventAction" : "registration",
"eventDate" : "2021-08-17T07:05:54-04:00"
} ],
"entities" : [ {
"handle" : "GORMA154-ARIN",
"vcardArray" : [ "vcard", [ [ "version", { }, "text", "4.0" ], [ "adr", {
"label" : "PO Box 232290\nCentreville\nVA\n20120\nUnited States"
}, "text", [ "", "", "", "", "", "", "" ] ], [ "fn", { }, "text", "Brad Gorman" ], [ "n", { }, "text", [ "Gorman", "Brad", "", "", "" ] ], [ "kind", { }, "text", "individual" ], [ "email", { }, "text", "bgorman@arin.net" ], [ "tel", {
"type" : [ "work", "voice" ]
}, "text", "+1-703-555-1212" ] ] ],
"roles" : [ "technical", "dns", "routing", "administrative", "abuse" ],
"links" : [ {
"value" : "https://rdap.arin.net/registry/domain/152.112.149.in-addr.arpa.",
"rel" : "self",
"type" : "application/rdap+json",
"href" : "https://rdap.arin.net/registry/entity/GORMA154-ARIN"
}, {
"value" : "https://rdap.arin.net/registry/domain/152.112.149.in-addr.arpa.",
"rel" : "alternate",
"type" : "application/xml",
"href" : "https://whois.arin.net/rest/poc/GORMA154-ARIN"
} ],
"events" : [ {
"eventAction" : "last changed",
"eventDate" : "2021-08-16T17:17:09-04:00"
}, {
"eventAction" : "registration",
"eventDate" : "2021-08-16T16:57:10-04:00"
} ],
"status" : [ "validated" ],
"port43" : "whois.arin.net",
"objectClassName" : "entity"
} ],
"port43" : "whois.arin.net",
"objectClassName" : "entity"
} ],
"port43" : "whois.arin.net",
"status" : [ "active" ],
"objectClassName" : "ip network",
"cidr0_cidrs" : [ {
"v4prefix" : "149.112.152.0",
"length" : 22
} ],
"arin_originas0_originautnums" : [ ]
},
"objectClassName" : "domain"
}Origin AS
The query to search for networks associated with an Origin AS value is:
<rdap-url>/arin_originas0_networksbyoriginas/<ORIGIN_AS_NUMBER>
where ORIGIN_AS_NUMBER is the value in the Origin AS field associated with the network. The Origin AS field contains a list of the ASNs, separated by commas or whitespace, from which the addresses in the network address block(s) may originate. (Do not include the AS prefix.)
To prevent performance issues, an Origin AS query limits the returned networks to 256 results.
Query Example:
https://rdap.arin.net/registry/arin_originas0_networksbyoriginas/10745
Sample Output:
{
"rdapConformance" : [ "nro_rdap_profile_0", "rdap_level_0", "arin_originas0", "cidr0" ],
"notices" : [ {
"title" : "Terms of Service",
"description" : [ "By using the ARIN RDAP/Whois service, you are agreeing to the RDAP/Whois Terms of Use" ],
"links" : [ {
"value" : "https://rdap.arin.net/registry/arin_originas0_networksbyoriginas/10745",
"rel" : "terms-of-service",
"type" : "text/html",
"href" : "https://www.arin.net/resources/registry/whois/tou/"
} ]
}, {
"title" : "Whois Inaccuracy Reporting",
"description" : [ "If you see inaccuracies in the results, please visit: " ],
"links" : [ {
"value" : "https://rdap.arin.net/registry/arin_originas0_networksbyoriginas/10745",
"rel" : "inaccuracy-report",
"type" : "text/html",
"href" : "https://www.arin.net/resources/registry/whois/inaccuracy_reporting/"
} ]
}, {
"title" : "Copyright Notice",
"description" : [ "Copyright 1997-2021, American Registry for Internet Numbers, Ltd." ]
} ],
"arin_originas0_networkSearchResults" : [ {
"handle" : "NET-192-136-136-0-1",
"startAddress" : "192.136.136.0",
"endAddress" : "192.136.136.255",
"ipVersion" : "v4",
"name" : "ARIN-CHA-1",
"type" : "DIRECT ASSIGNMENT",
"parentHandle" : "NET-192-0-0-0-0",
"events" : [ {
"eventAction" : "last changed",
"eventDate" : "2015-07-15T11:11:57-04:00"
}, {
"eventAction" : "registration",
"eventDate" : "2002-04-17T00:00:00-04:00"
} ],
"links" : [ {
"value" : "https://rdap.arin.net/registry/arin_originas0_networksbyoriginas/10745",
"rel" : "self",
"type" : "application/rdap+json",
"href" : "https://rdap.arin.net/registry/ip/192.136.136.0"
}, {
"value" : "https://rdap.arin.net/registry/arin_originas0_networksbyoriginas/10745",
"rel" : "alternate",
"type" : "application/xml",
"href" : "https://whois.arin.net/rest/net/NET-192-136-136-0-1"
} ],
"entities" : [ {
"handle" : "ARINOPS",
"vcardArray" : [ "vcard", [ [ "version", { }, "text", "4.0" ], [ "fn", { }, "text", "ARIN Operations" ], [ "adr", {
"label" : "PO Box 232290\nCentreville\nVA\n20120\nUnited States"
}, "text", [ "", "", "", "", "", "", "" ] ], [ "kind", { }, "text", "org" ] ] ],
"roles" : [ "registrant" ],
"links" : [ {
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"rel" : "self",
"type" : "application/rdap+json",
"href" : "https://rdap.arin.net/registry/entity/ARINOPS"
}, {
"value" : "https://rdap.arin.net/registry/arin_originas0_networksbyoriginas/10745",
"rel" : "alternate",
"type" : "application/xml",
"href" : "https://whois.arin.net/rest/org/ARINOPS"
} ],
"events" : [ {
"eventAction" : "last changed",
"eventDate" : "2020-06-16T16:12:29-04:00"
}, {
"eventAction" : "registration",
"eventDate" : "2012-09-07T18:41:45-04:00"
} ],
"entities" : [ {
"handle" : "FORST20-ARIN",
"vcardArray" : [ "vcard", [ [ "version", { }, "text", "4.0" ], [ "adr", {
"label" : "PO Box 232290\nCentreville\nVA\n20120\nUnited States"
}, "text", [ "", "", "", "", "", "", "" ] ], [ "fn", { }, "text", "Reggie Forster" ], [ "n", { }, "text", [ "Forster", "Reggie", "", "", "" ] ], [ "kind", { }, "text", "individual" ], [ "email", { }, "text", "rforster@arin.net" ], [ "tel", {
"type" : [ "work", "voice" ]
}, "text", "+1-703-555-1212" ] ] ],
"roles" : [ "technical" ],
"links" : [ {
"value" : "https://rdap.arin.net/registry/arin_originas0_networksbyoriginas/10745",
"rel" : "self",
"type" : "application/rdap+json",
"href" : "https://rdap.arin.net/registry/entity/FORST20-ARIN"
}, {
"value" : "https://rdap.arin.net/registry/arin_originas0_networksbyoriginas/10745",
"rel" : "alternate",
"type" : "application/xml",
"href" : "https://whois.arin.net/rest/poc/FORST20-ARIN"
} ],
"events" : [ {
"eventAction" : "last changed",
"eventDate" : "2021-06-16T15:43:22-04:00"
}, {
"eventAction" : "registration",
"eventDate" : "2020-06-16T16:11:43-04:00"
} ],
"status" : [ "validated" ],
"port43" : "whois.arin.net",
"objectClassName" : "entity"
}, {
"handle" : "KOSTE6-ARIN",
"vcardArray" : [ "vcard", [ [ "version", { }, "text", "4.0" ], [ "adr", {
"label" : "PO Box 232290\nCentreville\nVA\n20120\nUnited States"
}, "text", [ "", "", "", "", "", "", "" ] ], [ "fn", { }, "text", "Mark Kosters" ], [ "n", { }, "text", [ "Kosters", "Mark", "", "", "" ] ], [ "kind", { }, "text", "individual" ], [ "email", { }, "text", "markk@arin.net" ], [ "tel", {
"type" : [ "work", "voice" ]
}, "text", "+1-703-555-1212" ] ] ],
"roles" : [ "administrative" ],
"links" : [ {
"value" : "https://rdap.arin.net/registry/arin_originas0_networksbyoriginas/10745",
"rel" : "self",
"type" : "application/rdap+json",
"href" : "https://rdap.arin.net/registry/entity/KOSTE6-ARIN"
}, {
"value" : "https://rdap.arin.net/registry/arin_originas0_networksbyoriginas/10745",
"rel" : "alternate",
"type" : "application/xml",
"href" : "https://whois.arin.net/rest/poc/KOSTE6-ARIN"
} ],
"events" : [ {
"eventAction" : "last changed",
"eventDate" : "2021-04-23T12:03:43-04:00"
}, {
"eventAction" : "registration",
"eventDate" : "2012-09-07T18:38:22-04:00"
} ],
"status" : [ "validated" ],
"port43" : "whois.arin.net",
"objectClassName" : "entity"
}, {
"handle" : "AOA4-ARIN",
"vcardArray" : [ "vcard", [ [ "version", { }, "text", "4.0" ], [ "adr", {
"label" : "P.O. Box 232290\nCentreville\nVA\n20120\nUnited States"
}, "text", [ "", "", "", "", "", "", "" ] ], [ "fn", { }, "text", "ARIN Operations Abuse" ], [ "org", { }, "text", "ARIN Operations Abuse" ], [ "kind", { }, "text", "group" ], [ "email", { }, "text", "abuse@arin.net" ], [ "tel", {
"type" : [ "work", "voice" ]
}, "text", "+1-703-555-1212" ] ] ],
"roles" : [ "abuse" ],
"links" : [ {
"value" : "https://rdap.arin.net/registry/arin_originas0_networksbyoriginas/10745",
"rel" : "self",
"type" : "application/rdap+json",
"href" : "https://rdap.arin.net/registry/entity/AOA4-ARIN"
}, {
"value" : "https://rdap.arin.net/registry/arin_originas0_networksbyoriginas/10745",
"rel" : "alternate",
"type" : "application/xml",
"href" : "https://whois.arin.net/rest/poc/AOA4-ARIN"
} ],
"events" : [ {
"eventAction" : "last changed",
"eventDate" : "2021-06-15T10:40:47-04:00"
}, {
"eventAction" : "registration",
"eventDate" : "2012-09-07T18:40:58-04:00"
} ],
"status" : [ "validated" ],
"port43" : "whois.arin.net",
"objectClassName" : "entity"
}, {
"handle" : "TOSCA5-ARIN",
"vcardArray" : [ "vcard", [ [ "version", { }, "text", "4.0" ], [ "adr", {
"label" : "PO Box 232290\nCentreville\nVA\n20120\nUnited States"
}, "text", [ "", "", "", "", "", "", "" ] ], [ "fn", { }, "text", "Pete Toscano" ], [ "n", { }, "text", [ "Toscano", "Pete", "", "", "" ] ], [ "kind", { }, "text", "individual" ], [ "email", { }, "text", "pete@arin.net" ], [ "tel", {
"type" : [ "work", "voice" ]
}, "text", "+1-703-555-1212" ] ] ],
"roles" : [ "technical" ],
"links" : [ {
"value" : "https://rdap.arin.net/registry/arin_originas0_networksbyoriginas/10745",
"rel" : "self",
"type" : "application/rdap+json",
"href" : "https://rdap.arin.net/registry/entity/TOSCA5-ARIN"
}, {
"value" : "https://rdap.arin.net/registry/arin_originas0_networksbyoriginas/10745",
"rel" : "alternate",
"type" : "application/xml",
"href" : "https://whois.arin.net/rest/poc/TOSCA5-ARIN"
} ],
"events" : [ {
"eventAction" : "last changed",
"eventDate" : "2021-06-14T17:38:09-04:00"
}, {
"eventAction" : "registration",
"eventDate" : "2013-01-15T15:04:27-05:00"
} ],
"status" : [ "validated" ],
"port43" : "whois.arin.net",
"objectClassName" : "entity"
}, {
"handle" : "JEFFE114-ARIN",
"vcardArray" : [ "vcard", [ [ "version", { }, "text", "4.0" ], [ "adr", {
"label" : "PO Box 232290\nCentreville\nVA\n20120\nUnited States"
}, "text", [ "", "", "", "", "", "", "" ] ], [ "fn", { }, "text", "David Jeffers" ], [ "n", { }, "text", [ "Jeffers", "David", "", "", "" ] ], [ "kind", { }, "text", "individual" ], [ "email", { }, "text", "david@arin.net" ], [ "tel", {
"type" : [ "work", "voice" ]
}, "text", "+1-703-555-1212" ] ] ],
"roles" : [ "dns", "noc" ],
"links" : [ {
"value" : "https://rdap.arin.net/registry/arin_originas0_networksbyoriginas/10745",
"rel" : "self",
"type" : "application/rdap+json",
"href" : "https://rdap.arin.net/registry/entity/JEFFE114-ARIN"
}, {
"value" : "https://rdap.arin.net/registry/arin_originas0_networksbyoriginas/10745",
"rel" : "alternate",
"type" : "application/xml",
"href" : "https://whois.arin.net/rest/poc/JEFFE114-ARIN"
} ],
"events" : [ {
"eventAction" : "last changed",
"eventDate" : "2021-04-20T11:43:41-04:00"
}, {
"eventAction" : "registration",
"eventDate" : "2020-04-16T16:41:31-04:00"
} ],
"status" : [ "validated" ],
"port43" : "whois.arin.net",
"objectClassName" : "entity"
}, {
"handle" : "MJO282-ARIN",
"vcardArray" : [ "vcard", [ [ "version", { }, "text", "4.0" ], [ "adr", {
"label" : "PO Box 232290\nCentreville\nVA\n20120\nUnited States"
}, "text", [ "", "", "", "", "", "", "" ] ], [ "fn", { }, "text", "Michael J O'Neill" ], [ "n", { }, "text", [ "O'Neill", "Michael", "J", "", "" ] ], [ "kind", { }, "text", "individual" ], [ "email", { }, "text", "mjo@arin.net" ], [ "tel", {
"type" : [ "work", "voice" ]
}, "text", "+1-703-555-1212" ] ] ],
"roles" : [ "technical", "noc" ],
"links" : [ {
"value" : "https://rdap.arin.net/registry/arin_originas0_networksbyoriginas/10745",
"rel" : "self",
"type" : "application/rdap+json",
"href" : "https://rdap.arin.net/registry/entity/MJO282-ARIN"
}, {
"value" : "https://rdap.arin.net/registry/arin_originas0_networksbyoriginas/10745",
"rel" : "alternate",
"type" : "application/xml",
"href" : "https://whois.arin.net/rest/poc/MJO282-ARIN"
} ],
"events" : [ {
"eventAction" : "last changed",
"eventDate" : "2021-04-26T15:19:39-04:00"
}, {
"eventAction" : "registration",
"eventDate" : "2012-09-19T14:33:35-04:00"
} ],
"status" : [ "validated" ],
"port43" : "whois.arin.net",
"objectClassName" : "entity"
} ],
"port43" : "whois.arin.net",
"objectClassName" : "entity"
} ],
"port43" : "whois.arin.net",
"status" : [ "active" ],
"objectClassName" : "ip network",
"cidr0_cidrs" : [ {
"v6prefix" : "2001:500:4::",
"length" : 48
} ],
"arin_originas0_originautnums" : [ 10745 ]
} ]
}ASN
Queries for information regarding ASN registrations are of the form:
<rdap-url>/autnum/<asn> where <asn> is an ASN, without the AS prefix.
Query Example:
https://rdap.arin.net/registry/autnum/399970
Sample Output:
{
"rdapConformance" : [ "nro_rdap_profile_0", "rdap_level_0", "nro_rdap_profile_asn_flat_0" ],
"notices" : [ {
"title" : "Terms of Service",
"description" : [ "By using the ARIN RDAP/Whois service, you are agreeing to the RDAP/Whois Terms of Use" ],
"links" : [ {
"value" : "https://rdap.arin.net/registry/autnum/399970",
"rel" : "terms-of-service",
"type" : "text/html",
"href" : "https://www.arin.net/resources/registry/whois/tou/"
} ]
}, {
"title" : "Whois Inaccuracy Reporting",
"description" : [ "If you see inaccuracies in the results, please visit: " ],
"links" : [ {
"value" : "https://rdap.arin.net/registry/autnum/399970",
"rel" : "inaccuracy-report",
"type" : "text/html",
"href" : "https://www.arin.net/resources/registry/whois/inaccuracy_reporting/"
} ]
}, {
"title" : "Copyright Notice",
"description" : [ "Copyright 1997-2021, American Registry for Internet Numbers, Ltd." ]
} ],
"handle" : "AS399970",
"startAutnum" : 399970,
"endAutnum" : 399970,
"name" : "ARIN-RS-RND",
"events" : [ {
"eventAction" : "last changed",
"eventDate" : "2021-08-20T11:59:31-04:00"
}, {
"eventAction" : "registration",
"eventDate" : "2021-08-20T10:17:38-04:00"
} ],
"links" : [ {
"value" : "https://rdap.arin.net/registry/autnum/399970",
"rel" : "self",
"type" : "application/rdap+json",
"href" : "https://rdap.arin.net/registry/autnum/399970"
}, {
"value" : "https://rdap.arin.net/registry/autnum/399970",
"rel" : "alternate",
"type" : "application/xml",
"href" : "https://whois.arin.net/rest/asn/AS399970"
} ],
"entities" : [ {
"handle" : "ARINL",
"vcardArray" : [ "vcard", [ [ "version", { }, "text", "4.0" ], [ "fn", { }, "text", "ARIN Routing Security" ], [ "adr", {
"label" : "PO Box 232290\nCentreville\nVA\n20120\nUnited States"
}, "text", [ "", "", "", "", "", "", "" ] ], [ "kind", { }, "text", "org" ] ] ],
"roles" : [ "registrant" ],
"links" : [ {
"value" : "https://rdap.arin.net/registry/autnum/399970",
"rel" : "self",
"type" : "application/rdap+json",
"href" : "https://rdap.arin.net/registry/entity/ARINL"
}, {
"value" : "https://rdap.arin.net/registry/autnum/399970",
"rel" : "alternate",
"type" : "application/xml",
"href" : "https://whois.arin.net/rest/org/ARINL"
} ],
"events" : [ {
"eventAction" : "last changed",
"eventDate" : "2021-10-21T17:04:25-04:00"
}, {
"eventAction" : "registration",
"eventDate" : "2021-08-17T07:05:54-04:00"
} ],
"entities" : [ {
"handle" : "GORMA154-ARIN",
"vcardArray" : [ "vcard", [ [ "version", { }, "text", "4.0" ], [ "adr", {
"label" : "PO Box 232290\nCentreville\nVA\n20120\nUnited States"
}, "text", [ "", "", "", "", "", "", "" ] ], [ "fn", { }, "text", "Brad Gorman" ], [ "n", { }, "text", [ "Gorman", "Brad", "", "", "" ] ], [ "kind", { }, "text", "individual" ], [ "email", { }, "text", "bgorman@arin.net" ], [ "tel", {
"type" : [ "work", "voice" ]
}, "text", "+1-703-555-1212" ] ] ],
"roles" : [ "technical", "dns", "routing", "administrative", "abuse" ],
"links" : [ {
"value" : "https://rdap.arin.net/registry/autnum/399970",
"rel" : "self",
"type" : "application/rdap+json",
"href" : "https://rdap.arin.net/registry/entity/GORMA154-ARIN"
}, {
"value" : "https://rdap.arin.net/registry/autnum/399970",
"rel" : "alternate",
"type" : "application/xml",
"href" : "https://whois.arin.net/rest/poc/GORMA154-ARIN"
} ],
"events" : [ {
"eventAction" : "last changed",
"eventDate" : "2021-08-16T17:17:09-04:00"
}, {
"eventAction" : "registration",
"eventDate" : "2021-08-16T16:57:10-04:00"
} ],
"status" : [ "validated" ],
"port43" : "whois.arin.net",
"objectClassName" : "entity"
} ],
"port43" : "whois.arin.net",
"objectClassName" : "entity"
} ],
"port43" : "whois.arin.net",
"status" : [ "active" ],
"objectClassName" : "autnum"
}POC or Organization Identifier (Org ID)
Queries for information about entities (POCs and Org IDs) are of the form:
<rdap-url>/entity/<handle>
where the <handle> parameter represents the POC or Org ID/ Org Handle (e.g., KOSTE6-ARIN).
Query Example:
https://rdap.arin.net/registry/entity/koste6-arin
Sample Output:
{
"rdapConformance" : [ "nro_rdap_profile_0", "rdap_level_0" ],
"notices" : [ {
"title" : "Terms of Service",
"description" : [ "By using the ARIN RDAP/Whois service, you are agreeing to the RDAP/Whois Terms of Use" ],
"links" : [ {
"value" : "https://rdap.arin.net/registry/entity/koste6-arin",
"rel" : "terms-of-service",
"type" : "text/html",
"href" : "https://www.arin.net/resources/registry/whois/tou/"
} ]
}, {
"title" : "Whois Inaccuracy Reporting",
"description" : [ "If you see inaccuracies in the results, please visit: " ],
"links" : [ {
"value" : "https://rdap.arin.net/registry/entity/koste6-arin",
"rel" : "inaccuracy-report",
"type" : "text/html",
"href" : "https://www.arin.net/resources/registry/whois/inaccuracy_reporting/"
} ]
}, {
"title" : "Copyright Notice",
"description" : [ "Copyright 1997-2021, American Registry for Internet Numbers, Ltd." ]
} ],
"handle" : "KOSTE6-ARIN",
"vcardArray" : [ "vcard", [ [ "version", { }, "text", "4.0" ], [ "adr", {
"label" : "PO Box 232290\nCentreville\nVA\n20120\nUnited States"
}, "text", [ "", "", "", "", "", "", "" ] ], [ "fn", { }, "text", "Mark Kosters" ], [ "n", { }, "text", [ "Kosters", "Mark", "", "", "" ] ], [ "kind", { }, "text", "individual" ], [ "email", { }, "text", "markk@arin.net" ], [ "tel", {
"type" : [ "work", "voice" ]
}, "text", "+1-703-555-1212" ] ] ],
"links" : [ {
"value" : "https://rdap.arin.net/registry/entity/koste6-arin",
"rel" : "self",
"type" : "application/rdap+json",
"href" : "https://rdap.arin.net/registry/entity/KOSTE6-ARIN"
}, {
"value" : "https://rdap.arin.net/registry/entity/koste6-arin",
"rel" : "alternate",
"type" : "application/xml",
"href" : "https://whois.arin.net/rest/poc/KOSTE6-ARIN"
} ],
"events" : [ {
"eventAction" : "last changed",
"eventDate" : "2021-04-23T12:03:43-04:00"
}, {
"eventAction" : "registration",
"eventDate" : "2012-09-07T18:38:22-04:00"
} ],
"status" : [ "validated" ],
"port43" : "whois.arin.net",
"objectClassName" : "entity"
}Nameserver
Querying for nameservers (as specified in RFC 0952 and RFC 1123) is supported by domain registries, but is not supported for ARIN’s registration data through RDAP.
Where to Go for Additional Help with RDAP
For full details and specifications, please view the following IETF Internet Request for Comments (RFC) documents:
- RFC 7480 - HTTP Usage in the Registration Data Access Protocol (RDAP)
- RFC 7481 - Security Services for the Registration Data Access Protocol (RDAP)
- RFC 7482 - Registration Data Access Protocol (RDAP) Query Format
- RFC 7483 - JSON Responses for the Registration Data Access Protocol (RDAP)
- RFC 7484 - Finding the Authoritative Registration Data (RDAP) Service
- RFC 7485 - Inventory and Analysis of WHOIS Registration Objects
If you need help using the RDAP service, ARIN recommends subscribing and posting to the arin-tech-discuss mailing list. You may wish to check the mailing list archives before submitting your question.
Using Whois
- Whois/Registration Data Access Protocol (RDAP)
- Reporting a Whois Inaccuracy
- Whois-RWS
- Whois Terms of Use
Related
Registration Services Help Desk
7:00 AM to 7:00 PM ET
Phone: +1.703.227.0660
Fax: +1.703.997.8844