Whois & RDAP Lookup
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RDAPIP Range38.0.0.0 - 38.255.255.255
HandleNET-38-0-0-0-1
NameCOGENT-A
TypeDIRECT ALLOCATION
HolderCogent Communications, LLC
Registered1991-04-16 04:00 UTC
Updated2025-09-23 16:13 UTC
RegistrantCogent Communications, LLC
Address2450 N Street NW, Washington, DC, 20037, United States
Admin ContactIP Allocation
Email[email protected]
Phone+1-877-875-4311
Address2450 N Street NW, Washington, DC, 20037, United States
Tech ContactIP Allocation
Email[email protected]
Phone+1-877-875-4311
Address2450 N Street NW, Washington, DC, 20037, United States
Abuse Contact[email protected]
Abuse Phone+1-877-875-4311
Statusactive
Registry RDAPhttps://rdap.arin.net
Raw WHOIS response
# # ARIN WHOIS data and services are subject to the Terms of Use # available at: https://www.arin.net/resources/registry/whois/tou/ # # If you see inaccuracies in the results, please report at # https://www.arin.net/resources/registry/whois/inaccuracy_reporting/ # # Copyright 1997-2026, American Registry for Internet Numbers, Ltd. # NetRange: 38.0.0.0 - 38.255.255.255 CIDR: 38.0.0.0/8 NetName: COGENT-A NetHandle: NET-38-0-0-0-1 Parent: () NetType: Direct Allocation OriginAS: Organization: Cogent Communications, LLC (COGC) RegDate: 1991-04-16 Updated: 2025-09-23 Ref: https://rdap.arin.net/registry/ip/38.0.0.0 Cogent Communications, LLC (COGC) OrgAbuseHandle: COGEN-ARIN OrgAbuseName: Cogent Abuse OrgAbusePhone: +1-877-875-4311 OrgAbuseEmail: [email protected] OrgAbuseRef: https://rdap.arin.net/registry/entity/COGEN-ARIN OrgNOCHandle: ZC108-ARIN OrgNOCName: Cogent Communications OrgNOCPhone: +1-877-875-4311 OrgNOCEmail: [email protected] OrgNOCRef: https://rdap.arin.net/registry/entity/ZC108-ARIN OrgTechHandle: IPALL-ARIN OrgTechName: IP Allocation OrgTechPhone: +1-877-875-4311 OrgTechEmail: [email protected] OrgTechRef: https://rdap.arin.net/registry/entity/IPALL-ARIN # # ARIN WHOIS data and services are subject to the Terms of Use # available at: https://www.arin.net/resources/registry/whois/tou/ # # If you see inaccuracies in the results, please report at # https://www.arin.net/resources/registry/whois/inaccuracy_reporting/ # # Copyright 1997-2026, American Registry for Internet Numbers, Ltd. # % Query time: 489 msec % WHEN: Wed Jul 29 02:11:09 UTC 2026
Raw RDAP JSON (registry) https://rdap.arin.net
{
"arin_originas0_originautnums": [],
"cidr0_cidrs": [
{
"length": 8,
"v4prefix": "38.0.0.0"
}
],
"endAddress": "38.255.255.255",
"entities": [
{
"entities": [
{
"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/38.225.100.0/22"
},
{
"href": "https://whois.arin.net/rest/poc/COGEN-ARIN",
"rel": "alternate",
"type": "application/xml",
"value": "https://rdap.arin.net/registry/ip/38.225.100.0/22"
}
],
"objectClassName": "entity",
"port43": "whois.arin.net",
"roles": [
"abuse"
],
"status": [
"validated"
],
"vcardArray": [
"vcard",
[
[
"version",
{},
"text",
"4.0"
],
[
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{
"label": "2450 N street, NW\nWashington\nDC\n20037\nUnited States"
},
"text",
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],
[
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{},
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],
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{},
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"Cogent Abuse"
],
[
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{},
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],
[
"email",
{},
"text",
"[email protected]"
],
[
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{
"type": [
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]
},
"text",
"+1-877-875-4311"
]
]
]
},
{
"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/38.225.100.0/22"
},
{
"href": "https://whois.arin.net/rest/poc/ZC108-ARIN",
"rel": "alternate",
"type": "application/xml",
"value": "https://rdap.arin.net/registry/ip/38.225.100.0/22"
}
],
"objectClassName": "entity",
"port43": "whois.arin.net",
"roles": [
"noc"
],
"status": [
"validated"
],
"vcardArray": [
"vcard",
[
[
"version",
{},
"text",
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],
[
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{
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},
"text",
[
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],
[
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],
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[
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[
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"+1-877-875-4311"
]
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},
{
"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/38.225.100.0/22"
},
{
"href": "https://whois.arin.net/rest/poc/IPALL-ARIN",
"rel": "alternate",
"type": "application/xml",
"value": "https://rdap.arin.net/registry/ip/38.225.100.0/22"
}
],
"objectClassName": "entity",
"port43": "whois.arin.net",
"remarks": [
{
"description": [
"THIS CONTACT DOES NOT RESPOND TO ABUSE OR OPERATIONAL ISSUES\r",
"For abuse issues contact [email protected]\r",
"For operational issues contact [email protected]"
],
"title": "Registration Comments"
}
],
"roles": [
"administrative",
"technical"
],
"status": [
"validated"
],
"vcardArray": [
"vcard",
[
[
"version",
{},
"text",
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],
[
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{
"label": "2450 N Street NW\nWashington\nDC\n20037\nUnited States"
},
"text",
[
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""
]
],
[
"fn",
{},
"text",
"IP Allocation"
],
[
"org",
{},
"text",
"IP Allocation"
],
[
"kind",
{},
"text",
"group"
],
[
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{},
"text",
"[email protected]"
],
[
"tel",
{
"type": [
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]
},
"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/38.225.100.0/22"
},
{
"href": "https://whois.arin.net/rest/org/COGC",
"rel": "alternate",
"type": "application/xml",
"value": "https://rdap.arin.net/registry/ip/38.225.100.0/22"
}
],
"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",
{},
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],
[
"adr",
{
"label": "2450 N Street NW\nWashington\nDC\n20037\nUnited States"
},
"text",
[
"",
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]
],
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],
"events": [
{
"eventAction": "last changed",
"eventDate": "2025-09-23T12:13:55-04:00"
},
{
"eventAction": "registration",
"eventDate": "1991-04-16T00:00:00-04:00"
}
],
"handle": "NET-38-0-0-0-1",
"ipVersion": "v4",
"links": [
{
"href": "https://rdap.arin.net/registry/ip/38.0.0.0",
"rel": "self",
"type": "application/rdap+json",
"value": "https://rdap.arin.net/registry/ip/38.225.100.0/22"
},
{
"href": "https://whois.arin.net/rest/net/NET-38-0-0-0-1",
"rel": "alternate",
"type": "application/xml",
"value": "https://rdap.arin.net/registry/ip/38.225.100.0/22"
}
],
"name": "COGENT-A",
"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/38.225.100.0/22"
}
],
"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/38.225.100.0/22"
}
],
"title": "Whois Inaccuracy Reporting"
},
{
"description": [
"Copyright 1997-2026, American Registry for Internet Numbers, Ltd."
],
"title": "Copyright Notice"
}
],
"objectClassName": "ip network",
"port43": "whois.arin.net",
"rdapConformance": [
"nro_rdap_profile_0",
"rdap_level_0",
"cidr0",
"arin_originas0"
],
"startAddress": "38.0.0.0",
"status": [
"active"
],
"type": "DIRECT ALLOCATION"
}Frequently asked questions
What is WHOIS?
WHOIS is a public directory that answers "who is responsible for this?" for domains, IP ranges and ASNs. It lists registration dates, the registrar, nameservers and contacts.
What is RDAP, and how does it differ?
RDAP is the modern replacement for WHOIS. It returns the same records in a structured, consistent format. We query RDAP first and fall back to classic WHOIS text when a registry has not adopted it yet.
What is the difference between a registrar and a registrant?
The registrar is the company you register and manage a domain through, such as xTom or GoDaddy. The registrant is the person or organization that actually holds the domain.
What are nameservers?
Nameservers answer DNS questions for a domain and decide which IP addresses the name resolves to. They also show which DNS provider the domain uses.
What is DNSSEC?
DNSSEC adds cryptographic signatures to DNS answers so they cannot be quietly altered in transit. "Signed" means the domain has it enabled, "unsigned" means it does not.
Why is the contact information redacted?
Privacy laws such as GDPR require registrars to hide most personal details in public records. The abuse contact is usually still shown, so a domain or network can be reported when something goes wrong.