Registry · RDAP Original response https://rdap.arin.net/registry/ip/66.28.0.0 Copy record
{
"arin_originas0_originautnums": [],
"cidr0_cidrs": [
{
"v4prefix": "66.28.0.0 ",
"length": 16
}
],
"endAddress": "66.28.255.255 ",
"entities": [
{
"entities": [
{
"events": [
{
"eventAction": "last changed",
"eventDate": "2026-07-08T11:04:49-04:00"
},
{
"eventAction": "registration",
"eventDate": "2001-01-24T13:40:39-05:00"
}
],
"handle": "ZC108-ARIN",
"links": [
{
"href": "https://rdap.arin.net /registry/entity/ZC108-ARIN",
"rel": "self",
"type": "application/rdap+json",
"value": "https://rdap.arin.net /registry/ip/66.28.0.0"
},
{
"href": "https://whois.arin.net /rest/poc/ZC108-ARIN",
"rel": "alternate",
"type": "application/xml",
"value": "https://rdap.arin.net /registry/ip/66.28.0.0"
}
],
"objectClassName": "entity",
"port43": "whois.arin.net ",
"roles": [
"noc"
],
"status": [
"validated"
],
"vcardArray": [
"vcard",
[
[
"version",
[],
"text",
"4.0"
],
[
"adr",
{
"label": "2450 N Street NW\nWashington\nDC\n20037\nUnited States"
},
"text",
[
"",
"",
"",
"",
"",
"",
""
]
],
[
"fn",
[],
"text",
"Cogent Communications"
],
[
"org",
[],
"text",
"Cogent Communications"
],
[
"kind",
[],
"text",
"group"
],
[
"email",
[],
"text",
"noc@cogentco.com "
],
[
"tel",
{
"type": [
"work",
"voice"
]
},
"text",
"+1-877-875-4311"
]
]
]
},
{
"events": [
{
"eventAction": "last changed",
"eventDate": "2026-07-08T11:04:38-04:00"
},
{
"eventAction": "registration",
"eventDate": "2002-11-13T17:21:33-05:00"
}
],
"handle": "COGEN-ARIN",
"links": [
{
"href": "https://rdap.arin.net /registry/entity/COGEN-ARIN",
"rel": "self",
"type": "application/rdap+json",
"value": "https://rdap.arin.net /registry/ip/66.28.0.0"
},
{
"href": "https://whois.arin.net /rest/poc/COGEN-ARIN",
"rel": "alternate",
"type": "application/xml",
"value": "https://rdap.arin.net /registry/ip/66.28.0.0"
}
],
"objectClassName": "entity",
"port43": "whois.arin.net ",
"roles": [
"abuse"
],
"status": [
"validated"
],
"vcardArray": [
"vcard",
[
[
"version",
[],
"text",
"4.0"
],
[
"adr",
{
"label": "2450 N street, NW\nWashington\nDC\n20037\nUnited States"
},
"text",
[
"",
"",
"",
"",
"",
"",
""
]
],
[
"fn",
[],
"text",
"Cogent Abuse"
],
[
"org",
[],
"text",
"Cogent Communications"
],
[
"kind",
[],
"text",
"group"
],
[
"email",
[],
"text",
"abuse@cogentco.com "
],
[
"tel",
{
"type": [
"work",
"voice"
]
},
"text",
"+1-877-875-4311"
]
]
]
},
{
"events": [
{
"eventAction": "last changed",
"eventDate": "2026-07-08T11:04:59-04:00"
},
{
"eventAction": "registration",
"eventDate": "2002-11-13T17:21:33-05:00"
}
],
"handle": "IPALL-ARIN",
"links": [
{
"href": "https://rdap.arin.net /registry/entity/IPALL-ARIN",
"rel": "self",
"type": "application/rdap+json",
"value": "https://rdap.arin.net /registry/ip/66.28.0.0"
},
{
"href": "https://whois.arin.net /rest/poc/IPALL-ARIN",
"rel": "alternate",
"type": "application/xml",
"value": "https://rdap.arin.net /registry/ip/66.28.0.0"
}
],
"objectClassName": "entity",
"port43": "whois.arin.net ",
"remarks": [
{
"description": [
"THIS CONTACT DOES NOT RESPOND TO ABUSE OR OPERATIONAL ISSUES\r",
"For abuse issues contact abuse@cogentco.com \r",
"For operational issues contact noc@cogentco.com "
],
"title": "Registration Comments"
}
],
"roles": [
"technical",
"administrative"
],
"status": [
"validated"
],
"vcardArray": [
"vcard",
[
[
"version",
[],
"text",
"4.0"
],
[
"adr",
{
"label": "2450 N Street NW\nWashington\nDC\n20037\nUnited States"
},
"text",
[
"",
"",
"",
"",
"",
"",
""
]
],
[
"fn",
[],
"text",
"IP Allocation"
],
[
"org",
[],
"text",
"Cogent Communications"
],
[
"kind",
[],
"text",
"group"
],
[
"email",
[],
"text",
"ipalloc@cogentco.com "
],
[
"tel",
{
"type": [
"work",
"voice"
]
},
"text",
"+1-877-875-4311"
]
]
]
}
],
"events": [
{
"eventAction": "last changed",
"eventDate": "2025-09-23T12:07:44-04:00"
},
{
"eventAction": "registration",
"eventDate": "2000-05-30T00:00:00-04:00"
}
],
"handle": "COGC",
"links": [
{
"href": "https://rdap.arin.net /registry/entity/COGC",
"rel": "self",
"type": "application/rdap+json",
"value": "https://rdap.arin.net /registry/ip/66.28.0.0"
},
{
"href": "https://whois.arin.net /rest/org/COGC",
"rel": "alternate",
"type": "application/xml",
"value": "https://rdap.arin.net /registry/ip/66.28.0.0"
}
],
"objectClassName": "entity",
"port43": "whois.arin.net ",
"remarks": [
{
"description": [
"Geofeed https://geofeed.cogentco.com /geofeed.csv"
],
"title": "Registration Comments"
}
],
"roles": [
"registrant"
],
"vcardArray": [
"vcard",
[
[
"version",
[],
"text",
"4.0"
],
[
"fn",
[],
"text",
"Cogent Communications, LLC"
],
[
"adr",
{
"label": "2450 N Street NW\nWashington\nDC\n20037\nUnited States"
},
"text",
[
"",
"",
"",
"",
"",
"",
""
]
],
[
"kind",
[],
"text",
"org"
]
]
]
},
{
"events": [
{
"eventAction": "last changed",
"eventDate": "2026-07-08T11:04:49-04:00"
},
{
"eventAction": "registration",
"eventDate": "2001-01-24T13:40:39-05:00"
}
],
"handle": "ZC108-ARIN",
"links": [
{
"href": "https://rdap.arin.net /registry/entity/ZC108-ARIN",
"rel": "self",
"type": "application/rdap+json",
"value": "https://rdap.arin.net /registry/ip/66.28.0.0"
},
{
"href": "https://whois.arin.net /rest/poc/ZC108-ARIN",
"rel": "alternate",
"type": "application/xml",
"value": "https://rdap.arin.net /registry/ip/66.28.0.0"
}
],
"objectClassName": "entity",
"port43": "whois.arin.net ",
"roles": [
"technical"
],
"status": [
"validated"
],
"vcardArray": [
"vcard",
[
[
"version",
[],
"text",
"4.0"
],
[
"adr",
{
"label": "2450 N Street NW\nWashington\nDC\n20037\nUnited States"
},
"text",
[
"",
"",
"",
"",
"",
"",
""
]
],
[
"fn",
[],
"text",
"Cogent Communications"
],
[
"org",
[],
"text",
"Cogent Communications"
],
[
"kind",
[],
"text",
"group"
],
[
"email",
[],
"text",
"noc@cogentco.com "
],
[
"tel",
{
"type": [
"work",
"voice"
]
},
"text",
"+1-877-875-4311"
]
]
]
}
],
"events": [
{
"eventAction": "last changed",
"eventDate": "2025-09-10T13:33:44-04:00"
},
{
"eventAction": "registration",
"eventDate": "2000-10-12T00:00:00-04:00"
}
],
"handle": "NET-66-28-0-0-1",
"ipVersion": "v4",
"links": [
{
"href": "https://rdap.arin.net /registry/ip/66.28.0.0",
"rel": "self",
"type": "application/rdap+json",
"value": "https://rdap.arin.net /registry/ip/66.28.0.0"
},
{
"href": "https://whois.arin.net /rest/net/NET-66-28-0-0-1",
"rel": "alternate",
"type": "application/xml",
"value": "https://rdap.arin.net /registry/ip/66.28.0.0"
}
],
"name": "COGENT-NB-0000",
"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/66.28.0.0"
}
],
"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/66.28.0.0"
}
],
"title": "Whois Inaccuracy Reporting"
},
{
"description": [
"Copyright 1997-2026, American Registry for Internet Numbers, Ltd."
],
"title": "Copyright Notice"
}
],
"objectClassName": "ip network",
"parentHandle": "NET-66-0-0-0-0",
"port43": "whois.arin.net ",
"rdapConformance": [
"nro_rdap_profile_0",
"rdap_level_0",
"cidr0",
"arin_originas0"
],
"remarks": [
{
"description": [
"ADDRESSES WITHIN THIS BLOCK ARE NON-PORTABLE",
"Geofeed https://geofeed.cogentco.com /geofeed.csv",
"Reassignment information for this block can be found at rwhois.cogentco.com 4321"
],
"title": "Registration Comments"
}
],
"startAddress": "66.28.0.0 ",
"status": [
"active"
],
"type": "DIRECT ALLOCATION"
} 