Free network tools
AS WHOIS
Look up an Autonomous System — holder, registry, contacts, announced IPv4/IPv6 prefixes, upstreams and downstreams.
Network Report (All-in-one) BGP Looking Glass BGP Security Check RPKI Validator BGP Hijack & Leak Monitor ASN Intelligence Internet Outages & Anomalies Country Internet Report Domain Insights IP WHOIS AS WHOIS
AS36691
CSUP-AS - Colorado State University Announcing routesAS nameCSUP-AS
OrganisationColorado State University
Registry (RIR)ARIN
HandleAS36691
RangeAS36691
Registered18 Mar 2006
Last changed14 Feb 2024
Abuse contact[email protected]
1IPv4 prefixes
0IPv6 prefixes
1Upstreams
0Downstreams
Upstreams
| AS | Network name | Visibility |
|---|---|---|
| AS14041 | AS-FRGP - University Corporation for Atmospheric Research | 226 |
Downstreams
None seen.
IPv4 prefixes (1)
RPKI-validate all prefixes of AS36691
Contacts
| Role | Name | Handle | Email / phone | Address |
|---|---|---|---|---|
| registrant | Colorado State University | CSU-2 | Academic Computing and Networking Services, Colorado State University, 1018 Campus Delivery, Fort Collins, CO, 80523, United States | |
| administrative | Steve Steve Juarez | SSJ11-ARIN | [email protected], +1-970-491-4150, +1-970-443-3520 | 601 S Howes St, Fort Collins, CO, 80521, United States |
| technical, abuse | DNS Administrator | DNSAD191-ARIN | [email protected], +1-970-491-5600, +1-970-491-1958 | Academic Computing and Networking Services, Colorado State University, Fort Collins, CO, 80523, United States |
Raw registry response
{
"endAutnum": 36691,
"entities": [
{
"entities": [
{
"events": [
{
"eventAction": "last changed",
"eventDate": "2026-02-06T19:57:39-05:00"
},
{
"eventAction": "registration",
"eventDate": "2024-02-07T15:08:20-05:00"
}
],
"handle": "SSJ11-ARIN",
"links": [
{
"href": "https://rdap.arin.net/registry/entity/SSJ11-ARIN",
"rel": "self",
"type": "application/rdap+json",
"value": "https://rdap.arin.net/registry/autnum/36691"
},
{
"href": "https://whois.arin.net/rest/poc/SSJ11-ARIN",
"rel": "alternate",
"type": "application/xml",
"value": "https://rdap.arin.net/registry/autnum/36691"
}
],
"objectClassName": "entity",
"port43": "whois.arin.net",
"roles": [
"administrative"
],
"status": [
"validated"
],
"vcardArray": [
"vcard",
[
[
"version",
[],
"text",
"4.0"
],
[
"adr",
{
"label": "601 S Howes St\nFort Collins\nCO\n80521\nUnited States"
},
"text",
[
"",
"",
"",
"",
"",
"",
""
]
],
[
"fn",
[],
"text",
"Steve Steve Juarez"
],
[
"n",
[],
"text",
[
"Juarez",
"Steve",
"Steve",
"",
""
]
],
[
"kind",
[],
"text",
"individual"
],
[
"email",
[],
"text",
"[email protected]"
],
[
"tel",
{
"type": [
"work",
"voice"
]
},
"text",
"+1-970-491-4150"
],
[
"tel",
{
"type": [
"work",
"cell"
]
},
"text",
"+1-970-443-3520"
]
]
]
},
{
"events": [
{
"eventAction": "last changed",
"eventDate": "2026-06-12T10:28:56-04:00"
},
{
"eventAction": "registration",
"eventDate": "2007-03-07T18:18:39-05:00"
}
],
"handle": "DNSAD191-ARIN",
"links": [
{
"href": "https://rdap.arin.net/registry/entity/DNSAD191-ARIN",
"rel": "self",
"type": "application/rdap+json",
"value": "https://rdap.arin.net/registry/autnum/36691"
},
{
"href": "https://whois.arin.net/rest/poc/DNSAD191-ARIN",
"rel": "alternate",
"type": "application/xml",
"value": "https://rdap.arin.net/registry/autnum/36691"
}
],
"objectClassName": "entity",
"port43": "whois.arin.net",
"roles": [
"technical",
"abuse"
],
"status": [
"validated"
],
"vcardArray": [
"vcard",
[
[
"version",
[],
"text",
"4.0"
],
[
"adr",
{
"label": "Academic Computing and Networking Services\nColorado State University\nFort Collins\nCO\n80523\nUnited States"
},
"text",
[
"",
"",
"",
"",
"",
"",
""
]
],
[
"fn",
[],
"text",
"DNS Administrator"
],
[
"org",
[],
"text",
"Colorado State University"
],
[
"kind",
[],
"text",
"group"
],
[
"email",
[],
"text",
"[email protected]"
],
[
"tel",
{
"type": [
"work",
"voice"
]
},
"text",
"+1-970-491-5600"
],
[
"tel",
{
"type": [
"work",
"fax"
]
},
"text",
"+1-970-491-1958"
]
]
]
}
],
"events": [
{
"eventAction": "last changed",
"eventDate": "2024-11-25T11:09:46-05:00"
}
],
"handle": "CSU-2",
"links": [
{
"href": "https://rdap.arin.net/registry/entity/CSU-2",
"rel": "self",
"type": "application/rdap+json",
"value": "https://rdap.arin.net/registry/autnum/36691"
},
{
"href": "https://whois.arin.net/rest/org/CSU-2",
"rel": "alternate",
"type": "application/xml",
"value": "https://rdap.arin.net/registry/autnum/36691"
}
],
"objectClassName": "entity",
"port43": "whois.arin.net",
"roles": [
"registrant"
],
"vcardArray": [
"vcard",
[
[
"version",
[],
"text",
"4.0"
],
[
"fn",
[],
"text",
"Colorado State University"
],
[
"adr",
{
"label": "Academic Computing and Networking Services\nColorado State University\n1018 Campus Delivery\nFort Collins\nCO\n80523\nUnited States"
},
"text",
[
"",
"",
"",
"",
"",
"",
""
]
],
[
"kind",
[],
"text",
"org"
]
]
]
}
],
"events": [
{
"eventAction": "last changed",
"eventDate": "2024-02-14T09:12:42-05:00"
},
{
"eventAction": "registration",
"eventDate": "2006-03-17T17:59:13-05:00"
}
],
"handle": "AS36691",
"links": [
{
"href": "https://rdap.arin.net/registry/autnum/36691",
"rel": "self",
"type": "application/rdap+json",
"value": "https://rdap.arin.net/registry/autnum/36691"
},
{
"href": "https://whois.arin.net/rest/asn/AS36691",
"rel": "alternate",
"type": "application/xml",
"value": "https://rdap.arin.net/registry/autnum/36691"
}
],
"name": "CSUP-AS",
"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/autnum/36691"
}
],
"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/autnum/36691"
}
],
"title": "Whois Inaccuracy Reporting"
},
{
"description": [
"Copyright 1997-2026, American Registry for Internet Numbers, Ltd."
],
"title": "Copyright Notice"
}
],
"objectClassName": "autnum",
"port43": "whois.arin.net",
"rdapConformance": [
"nro_rdap_profile_0",
"rdap_level_0",
"nro_rdap_profile_asn_flat_0"
],
"startAutnum": 36691,
"status": [
"active"
]
}Results come from public internet registries and live global routing data. Results are cached for up to an hour. Lookups are logged with your IP address to prevent abuse — see our Privacy Policy.