Registry · RDAP Original response
https://rdap.arin.net/registry/ip/152.121.4.0/24
{
"arin_originas0_originautnums": [],
"cidr0_cidrs": [
{
"v4prefix": "152.121.0.0",
"length": 16
},
{
"v4prefix": "152.122.0.0",
"length": 15
}
],
"endAddress": "152.123.255.255",
"entities": [
{
"entities": [
{
"events": [
{
"eventAction": "last changed",
"eventDate": "2026-07-06T19:31:57-04:00"
},
{
"eventAction": "registration",
"eventDate": "2009-12-03T09:18:25-05:00"
}
],
"handle": "NETWO3558-ARIN",
"links": [
{
"href": "https://rdap.arin.net/registry/entity/NETWO3558-ARIN",
"rel": "self",
"type": "application/rdap+json",
"value": "https://rdap.arin.net/registry/ip/152.121.4.0/24"
},
{
"href": "https://whois.arin.net/rest/poc/NETWO3558-ARIN",
"rel": "alternate",
"type": "application/xml",
"value": "https://rdap.arin.net/registry/ip/152.121.4.0/24"
}
],
"objectClassName": "entity",
"port43": "whois.arin.net",
"roles": [
"technical",
"administrative",
"abuse"
],
"status": [
"validated"
],
"vcardArray": [
"vcard",
[
[
"version",
[],
"text",
"4.0"
],
[
"adr",
{
"label": "1200 New Jersey Ave SE\nWashington\nDC\n20590\nUnited States"
},
"text",
[
"",
"",
"",
"",
"",
"",
""
]
],
[
"fn",
[],
"text",
"Network Engineering"
],
[
"org",
[],
"text",
"U.S. Department of Transportation"
],
[
"kind",
[],
"text",
"group"
],
[
"email",
[],
"text",
"list-ost-net-team@dot.gov"
],
[
"email",
[],
"text",
"jeffrey.callaham@dot.gov"
],
[
"tel",
{
"type": [
"work",
"voice"
]
},
"text",
"+1-202-385-4357"
],
[
"tel",
{
"type": [
"work",
"voice"
]
},
"text",
"+1-202-503-5469"
]
]
]
}
],
"events": [
{
"eventAction": "last changed",
"eventDate": "2026-07-14T17:41:46-04:00"
},
{
"eventAction": "registration",
"eventDate": "1993-04-22T00:00:00-04:00"
}
],
"handle": "USDT-1",
"links": [
{
"href": "https://rdap.arin.net/registry/entity/USDT-1",
"rel": "self",
"type": "application/rdap+json",
"value": "https://rdap.arin.net/registry/ip/152.121.4.0/24"
},
{
"href": "https://whois.arin.net/rest/org/USDT-1",
"rel": "alternate",
"type": "application/xml",
"value": "https://rdap.arin.net/registry/ip/152.121.4.0/24"
}
],
"objectClassName": "entity",
"port43": "whois.arin.net",
"roles": [
"registrant"
],
"vcardArray": [
"vcard",
[
[
"version",
[],
"text",
"4.0"
],
[
"fn",
[],
"text",
"U. S. Department of Transportation"
],
[
"adr",
{
"label": "1200 New Jersey Ave. S.E.\nWashington\nDC\n20590\nUnited States"
},
"text",
[
"",
"",
"",
"",
"",
"",
""
]
],
[
"kind",
[],
"text",
"org"
]
]
]
}
],
"events": [
{
"eventAction": "last changed",
"eventDate": "2026-05-18T11:38:08-04:00"
},
{
"eventAction": "registration",
"eventDate": "1991-08-15T00:00:00-04:00"
}
],
"handle": "NET-152-121-0-0-1",
"ipVersion": "v4",
"links": [
{
"href": "https://rdap.arin.net/registry/ip/152.121.0.0",
"rel": "self",
"type": "application/rdap+json",
"value": "https://rdap.arin.net/registry/ip/152.121.4.0/24"
},
{
"href": "https://whois.arin.net/rest/net/NET-152-121-0-0-1",
"rel": "alternate",
"type": "application/xml",
"value": "https://rdap.arin.net/registry/ip/152.121.4.0/24"
}
],
"name": "USDT-1",
"notices": [
{
"description": [
"By using the ARIN RDAP/Whois service, you are agreeing to the RDAP/Whois Terms of Use"
],
"links": [
{
"href": "https://www.arin.net/resources/registry/whois/tou/",
"rel": "terms-of-service",
"type": "text/html",
"value": "https://rdap.arin.net/registry/ip/152.121.4.0/24"
}
],
"title": "Terms of Service"
},
{
"description": [
"If you see inaccuracies in the results, please visit: "
],
"links": [
{
"href": "https://www.arin.net/resources/registry/whois/inaccuracy_reporting/",
"rel": "inaccuracy-report",
"type": "text/html",
"value": "https://rdap.arin.net/registry/ip/152.121.4.0/24"
}
],
"title": "Whois Inaccuracy Reporting"
},
{
"description": [
"Copyright 1997-2026, American Registry for Internet Numbers, Ltd."
],
"title": "Copyright Notice"
}
],
"objectClassName": "ip network",
"parentHandle": "NET-152-0-0-0-0",
"port43": "whois.arin.net",
"rdapConformance": [
"nro_rdap_profile_0",
"rdap_level_0",
"cidr0",
"arin_originas0"
],
"startAddress": "152.121.0.0",
"status": [
"active"
],
"type": "DIRECT ALLOCATION"
}