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
AS101
WASH-NSF-AS - University of Washington Announcing routesAS nameWASH-NSF-AS
OrganisationUniversity of Washington
Registry (RIR)ARIN
HandleAS101
RangeAS101
Registered31 Mar 1987
Last changed02 Oct 2021
3IPv4 prefixes
3IPv6 prefixes
14Upstreams
18Downstreams
Upstreams
| AS | Network name | Visibility |
|---|---|---|
| AS3356 | LEVEL3 - Level 3 Parent, LLC | 2893 |
| AS174 | COGENT-174 - Cogent Communications, LLC | 2736 |
| AS6939 | HURRICANE - Hurricane Electric LLC | 1664 |
| AS11164 | INTERNET2-I2PX - Internet2 | 746 |
| AS3491 | PCCWG-APAC-HK - PCCW Global (HK) Ltd. | 480 |
| AS11537 | INTERNET2-RESEARCH-EDU - Internet2 | 214 |
| AS9002 | RETN-AS RETN Limited | 76 |
| AS7575 | AARNET-AS-AP - Australian Academic and Research Network (AARNet) | 69 |
| AS2497 | IIJ - Internet Initiative Japan Inc. | 64 |
| AS293 | ESNET - ESnet | 45 |
| AS137409 | GSLNETWORKS-AS-AP - GSL Networks Pty LTD | 40 |
| AS394256 | CLOUDSINGULARITY - Tech Futures Interactive Inc. | 38 |
| AS52025 | PARADOXNETWORKS-LIMITED ParadoxNetworks Limited | 28 |
| AS2907 | SINET-AS - Research Organization of Information and Systems, National Institute of Informatics | 8 |
Downstreams
| AS | Network name | Visibility |
|---|---|---|
| AS10430 | WA-K20 - Washington State K-20 Telecommunications Network | 5358 |
| AS73 | WASHINGTON-AS - University of Washington | 568 |
| AS19014 | NORCOM - NORCOM | 341 |
| AS11956 | NOAA-XWAVE - National Oceanic and Atmospheric Administration | 339 |
| AS14221 | UW-GR-AS - University of Washington | 336 |
| AS39941 | PACIFIC-WAVE - Pacific Wave | 320 |
| AS17200 | SEATTLECOLL - Seattle Community College District | 234 |
| AS14954 | FHCRC - The Fred Hutchinson Cancer Research Center | 231 |
| AS11548 | HERITAGE-UNIV-AS - Heritage University | 228 |
| AS40272 | ALLENINSTITUTE - Allen Institute | 228 |
| AS54429 | LOCAL-CONNECTIVITY-LAB - Local Connectivity Lab | 218 |
| AS7774 | ALASKA - University of Alaska | 216 |
| AS3807 | UMTNET-ASN - University of Montana | 207 |
| AS13476 | MSU-BOZEMAN - Montana State University | 166 |
| AS4193 | WA-STATE-GOV - State of Washington | 80 |
IPv4 prefixes (3)
IPv6 prefixes (3)
RPKI-validate all prefixes of AS101
Contacts
| Role | Name | Handle | Email / phone | Address |
|---|---|---|---|---|
| registrant | University of Washington | UWND-Z | 4545 15th Ave NE, Seattle, WA, 98105, United States | |
| abuse | University of Washington Security Operations | UWSO-ARIN | [email protected], [email protected], +1-206-221-7000 | 4545 15th Ave NE, Seattle, WA, 98105, United States |
| technical, noc, administrative | University of Washington Networks and Distributed | UW-NOC-ARIN | [email protected], +1-206-221-6000 | 4545 15th Avenue NE, 354841, Seattle, WA, 98105-4527, United States |
| technical | University of Washington Networks and Distributed | UW-NOC-ARIN | [email protected], +1-206-221-6000 | 4545 15th Avenue NE, 354841, Seattle, WA, 98105-4527, United States |
Raw registry response
{
"endAutnum": 101,
"entities": [
{
"entities": [
{
"events": [
{
"eventAction": "last changed",
"eventDate": "2021-10-22T18:51:57-04:00"
},
{
"eventAction": "registration",
"eventDate": "2004-02-02T08:56:44-05:00"
}
],
"handle": "UWSO-ARIN",
"links": [
{
"href": "https://rdap.arin.net/registry/entity/UWSO-ARIN",
"rel": "self",
"type": "application/rdap+json",
"value": "https://rdap.arin.net/registry/autnum/101"
},
{
"href": "https://whois.arin.net/rest/poc/UWSO-ARIN",
"rel": "alternate",
"type": "application/xml",
"value": "https://rdap.arin.net/registry/autnum/101"
}
],
"objectClassName": "entity",
"port43": "whois.arin.net",
"remarks": [
{
"description": [
"ARIN has attempted to validate the data for this POC, but has received no response from the POC since 2022-10-22"
],
"title": "Unvalidated POC"
}
],
"roles": [
"abuse"
],
"vcardArray": [
"vcard",
[
[
"version",
[],
"text",
"4.0"
],
[
"adr",
{
"label": "4545 15th Ave NE\nSeattle\nWA\n98105\nUnited States"
},
"text",
[
"",
"",
"",
"",
"",
"",
""
]
],
[
"fn",
[],
"text",
"University of Washington Security Operations"
],
[
"org",
[],
"text",
"University of Washington"
],
[
"kind",
[],
"text",
"group"
],
[
"email",
[],
"text",
"[email protected]"
],
[
"email",
[],
"text",
"[email protected]"
],
[
"tel",
{
"type": [
"work",
"voice"
]
},
"text",
"+1-206-221-7000"
]
]
]
},
{
"events": [
{
"eventAction": "last changed",
"eventDate": "2025-12-17T14:51:38-05:00"
}
],
"handle": "UW-NOC-ARIN",
"links": [
{
"href": "https://rdap.arin.net/registry/entity/UW-NOC-ARIN",
"rel": "self",
"type": "application/rdap+json",
"value": "https://rdap.arin.net/registry/autnum/101"
},
{
"href": "https://whois.arin.net/rest/poc/UW-NOC-ARIN",
"rel": "alternate",
"type": "application/xml",
"value": "https://rdap.arin.net/registry/autnum/101"
}
],
"objectClassName": "entity",
"port43": "whois.arin.net",
"roles": [
"technical",
"noc",
"administrative"
],
"status": [
"validated"
],
"vcardArray": [
"vcard",
[
[
"version",
[],
"text",
"4.0"
],
[
"adr",
{
"label": "4545 15th Avenue NE, 354841\nSeattle\nWA\n98105-4527\nUnited States"
},
"text",
[
"",
"",
"",
"",
"",
"",
""
]
],
[
"fn",
[],
"text",
"University of Washington Networks and Distributed"
],
[
"org",
[],
"text",
"University of Washington"
],
[
"kind",
[],
"text",
"group"
],
[
"email",
[],
"text",
"[email protected]"
],
[
"tel",
{
"type": [
"work",
"voice"
]
},
"text",
"+1-206-221-6000"
]
]
]
}
],
"events": [
{
"eventAction": "last changed",
"eventDate": "2026-06-15T17:18:29-04:00"
},
{
"eventAction": "registration",
"eventDate": "2020-05-20T21:04:11-04:00"
}
],
"handle": "UWND-Z",
"links": [
{
"href": "https://rdap.arin.net/registry/entity/UWND-Z",
"rel": "self",
"type": "application/rdap+json",
"value": "https://rdap.arin.net/registry/autnum/101"
},
{
"href": "https://whois.arin.net/rest/org/UWND-Z",
"rel": "alternate",
"type": "application/xml",
"value": "https://rdap.arin.net/registry/autnum/101"
}
],
"objectClassName": "entity",
"port43": "whois.arin.net",
"roles": [
"registrant"
],
"vcardArray": [
"vcard",
[
[
"version",
[],
"text",
"4.0"
],
[
"fn",
[],
"text",
"University of Washington"
],
[
"adr",
{
"label": "4545 15th Ave NE\nSeattle\nWA\n98105\nUnited States"
},
"text",
[
"",
"",
"",
"",
"",
"",
""
]
],
[
"kind",
[],
"text",
"org"
]
]
]
},
{
"events": [
{
"eventAction": "last changed",
"eventDate": "2025-12-17T14:51:38-05:00"
}
],
"handle": "UW-NOC-ARIN",
"links": [
{
"href": "https://rdap.arin.net/registry/entity/UW-NOC-ARIN",
"rel": "self",
"type": "application/rdap+json",
"value": "https://rdap.arin.net/registry/autnum/101"
},
{
"href": "https://whois.arin.net/rest/poc/UW-NOC-ARIN",
"rel": "alternate",
"type": "application/xml",
"value": "https://rdap.arin.net/registry/autnum/101"
}
],
"objectClassName": "entity",
"port43": "whois.arin.net",
"roles": [
"technical"
],
"status": [
"validated"
],
"vcardArray": [
"vcard",
[
[
"version",
[],
"text",
"4.0"
],
[
"adr",
{
"label": "4545 15th Avenue NE, 354841\nSeattle\nWA\n98105-4527\nUnited States"
},
"text",
[
"",
"",
"",
"",
"",
"",
""
]
],
[
"fn",
[],
"text",
"University of Washington Networks and Distributed"
],
[
"org",
[],
"text",
"University of Washington"
],
[
"kind",
[],
"text",
"group"
],
[
"email",
[],
"text",
"[email protected]"
],
[
"tel",
{
"type": [
"work",
"voice"
]
},
"text",
"+1-206-221-6000"
]
]
]
}
],
"events": [
{
"eventAction": "last changed",
"eventDate": "2021-10-01T20:46:23-04:00"
},
{
"eventAction": "registration",
"eventDate": "1987-03-31T00:00:00-05:00"
}
],
"handle": "AS101",
"links": [
{
"href": "https://rdap.arin.net/registry/autnum/101",
"rel": "self",
"type": "application/rdap+json",
"value": "https://rdap.arin.net/registry/autnum/101"
},
{
"href": "https://whois.arin.net/rest/asn/AS101",
"rel": "alternate",
"type": "application/xml",
"value": "https://rdap.arin.net/registry/autnum/101"
}
],
"name": "WASH-NSF-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/101"
}
],
"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/101"
}
],
"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": 101,
"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.