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
AS2381
WISCNET1-AS - WiscNet Announcing routesAS nameWISCNET1-AS
OrganisationWiscNet
Registry (RIR)ARIN
HandleAS2381
RangeAS2381
Registered03 Feb 1993
Last changed28 Feb 2024
Abuse contact[email protected]
37IPv4 prefixes
2IPv6 prefixes
12Upstreams
35Downstreams
Upstreams
| AS | Network name | Visibility |
|---|---|---|
| AS6939 | HURRICANE - Hurricane Electric LLC | 11050 |
| AS1299 | TWELVE99 Arelion Sweden AB | 1196 |
| AS3257 | GTT-BACKBONE GTT Communications Inc. | 516 |
| AS11164 | INTERNET2-I2PX - Internet2 | 344 |
| AS11537 | INTERNET2-RESEARCH-EDU - Internet2 | 181 |
| AS3303 | SWISSCOM Swisscom (Schweiz) AG | 140 |
| AS137409 | GSLNETWORKS-AS-AP - GSL Networks Pty LTD | 120 |
| AS8220 | COLT COLT Technology Services Group Limited | 65 |
| AS293 | ESNET - ESnet | 30 |
| AS29838 | AMC - Atlantic Metro Communications II, Inc. | 7 |
| AS286 | KPN GTT Communications Inc. | 6 |
| AS32621 | TCV-511 - Twin City VoIP, Inc. | 2 |
Downstreams
| AS | Network name | Visibility |
|---|---|---|
| AS19782 | INDIANAGIGAPOP - Indiana University | 3519 |
| AS3128 | BRUWS-AS3128 - University of Wisconsin System | 1051 |
| AS47015 | SHH-SJH - Sacred Heart Hospital | 567 |
| AS40379 | PIO-1846 - Carroll College | 471 |
| AS11500 | MSOE-INTERNET - Milwaukee School of Engineering | 436 |
| AS25979 | COMDC-WI - CITY OF MADISON | 338 |
| AS53355 | CUW-1 - Concordia University Wisconsin | 332 |
| AS33503 | MCW-1-AS - Medical College of Wisconsin | 331 |
| AS3676 | UIOWA-AS - University of Iowa | 331 |
| AS22971 | SVHHSTOSF-NET - ST. VINCENT HOSPITAL OF THE HOSPITAL SISTERS OF THE THIRD ORDER OF ST. FRANCIS | 291 |
| AS394316 | ALTRA - Altra Federal Credit Union | 285 |
| AS395963 | WCAN - WCAN | 285 |
| AS22066 | CITY-OF-EAU-CLAIRE - City of Eau Claire | 284 |
| AS22137 | BCW - Blood Center of Wisconsin, Inc. | 284 |
| AS393257 | LAWREN-1 - Lawrence University | 284 |
IPv4 prefixes (37)
143.109.192.0/19199.233.44.0/24198.150.0.0/16199.233.84.0/24204.128.237.0/24216.56.252.0/23192.156.230.0/24204.128.235.0/24204.128.234.0/24165.128.0.0/1664.189.15.0/24199.233.142.0/24192.206.48.0/24199.233.45.0/24199.248.186.0/24204.145.232.0/24170.125.0.0/16204.128.241.0/24140.104.0.0/16208.85.28.0/22204.128.238.0/24199.233.44.0/23143.109.64.0/19204.128.233.0/24216.56.0.0/16204.128.240.0/24204.128.236.0/24204.128.242.0/24199.233.86.0/24199.197.64.0/18160.32.0.0/22205.213.0.0/16148.59.44.0/24140.189.0.0/16144.89.0.0/18199.242.176.0/24170.125.238.0/23
IPv6 prefixes (2)
RPKI-validate all prefixes of AS2381
Contacts
| Role | Name | Handle | Email / phone | Address |
|---|---|---|---|---|
| registrant | WiscNet | WISC-Z | 605 Science Drive, Madison, WI, 53711, United States | |
| abuse | Abuse | ABUSE8958-ARIN | [email protected], +1-608-442-6761;ext2 | 605 Science Dr, Madison, WI, 53711, United States |
| administrative, technical | WiscNet NIC | WN29-ORG-ARIN | [email protected], +1-608-442-6761;ext2, +1-608-210-3979 | 605 Science Drive, Madison, WI, 53711, United States |
| abuse | Abuse | ABUSE8958-ARIN | [email protected], +1-608-442-6761;ext2 | 605 Science Dr, Madison, WI, 53711, United States |
| technical | WiscNet NIC | WN29-ORG-ARIN | [email protected], +1-608-442-6761;ext2, +1-608-210-3979 | 605 Science Drive, Madison, WI, 53711, United States |
Raw registry response
{
"endAutnum": 2381,
"entities": [
{
"entities": [
{
"events": [
{
"eventAction": "last changed",
"eventDate": "2026-03-05T12:44:36-05:00"
},
{
"eventAction": "registration",
"eventDate": "2024-02-28T08:57:26-05:00"
}
],
"handle": "ABUSE8958-ARIN",
"links": [
{
"href": "https://rdap.arin.net/registry/entity/ABUSE8958-ARIN",
"rel": "self",
"type": "application/rdap+json",
"value": "https://rdap.arin.net/registry/autnum/2381"
},
{
"href": "https://whois.arin.net/rest/poc/ABUSE8958-ARIN",
"rel": "alternate",
"type": "application/xml",
"value": "https://rdap.arin.net/registry/autnum/2381"
}
],
"objectClassName": "entity",
"port43": "whois.arin.net",
"roles": [
"abuse"
],
"status": [
"validated"
],
"vcardArray": [
"vcard",
[
[
"version",
[],
"text",
"4.0"
],
[
"adr",
{
"label": "605 Science Dr\nMadison\nWI\n53711\nUnited States"
},
"text",
[
"",
"",
"",
"",
"",
"",
""
]
],
[
"fn",
[],
"text",
"Abuse"
],
[
"org",
[],
"text",
"WiscNet"
],
[
"kind",
[],
"text",
"group"
],
[
"email",
[],
"text",
"[email protected]"
],
[
"tel",
{
"type": [
"work",
"voice"
]
},
"text",
"+1-608-442-6761;ext2"
]
]
]
},
{
"events": [
{
"eventAction": "last changed",
"eventDate": "2025-12-16T14:46:12-05:00"
},
{
"eventAction": "registration",
"eventDate": "1997-09-17T10:34:04-04:00"
}
],
"handle": "WN29-ORG-ARIN",
"links": [
{
"href": "https://rdap.arin.net/registry/entity/WN29-ORG-ARIN",
"rel": "self",
"type": "application/rdap+json",
"value": "https://rdap.arin.net/registry/autnum/2381"
},
{
"href": "https://whois.arin.net/rest/poc/WN29-ORG-ARIN",
"rel": "alternate",
"type": "application/xml",
"value": "https://rdap.arin.net/registry/autnum/2381"
}
],
"objectClassName": "entity",
"port43": "whois.arin.net",
"roles": [
"administrative",
"technical"
],
"status": [
"validated"
],
"vcardArray": [
"vcard",
[
[
"version",
[],
"text",
"4.0"
],
[
"adr",
{
"label": "605 Science Drive\nMadison\nWI\n53711\nUnited States"
},
"text",
[
"",
"",
"",
"",
"",
"",
""
]
],
[
"fn",
[],
"text",
"WiscNet NIC"
],
[
"org",
[],
"text",
"WiscNet"
],
[
"kind",
[],
"text",
"group"
],
[
"email",
[],
"text",
"[email protected]"
],
[
"tel",
{
"type": [
"work",
"voice"
]
},
"text",
"+1-608-442-6761;ext2"
],
[
"tel",
{
"type": [
"work",
"fax"
]
},
"text",
"+1-608-210-3979"
]
]
]
}
],
"events": [
{
"eventAction": "last changed",
"eventDate": "2024-02-28T09:04:09-05:00"
},
{
"eventAction": "registration",
"eventDate": "2022-08-01T09:41:38-04:00"
}
],
"handle": "WISC-Z",
"links": [
{
"href": "https://rdap.arin.net/registry/entity/WISC-Z",
"rel": "self",
"type": "application/rdap+json",
"value": "https://rdap.arin.net/registry/autnum/2381"
},
{
"href": "https://whois.arin.net/rest/org/WISC-Z",
"rel": "alternate",
"type": "application/xml",
"value": "https://rdap.arin.net/registry/autnum/2381"
}
],
"objectClassName": "entity",
"port43": "whois.arin.net",
"roles": [
"registrant"
],
"vcardArray": [
"vcard",
[
[
"version",
[],
"text",
"4.0"
],
[
"fn",
[],
"text",
"WiscNet"
],
[
"adr",
{
"label": "605 Science Drive\nMadison\nWI\n53711\nUnited States"
},
"text",
[
"",
"",
"",
"",
"",
"",
""
]
],
[
"kind",
[],
"text",
"org"
]
]
]
},
{
"events": [
{
"eventAction": "last changed",
"eventDate": "2026-03-05T12:44:36-05:00"
},
{
"eventAction": "registration",
"eventDate": "2024-02-28T08:57:26-05:00"
}
],
"handle": "ABUSE8958-ARIN",
"links": [
{
"href": "https://rdap.arin.net/registry/entity/ABUSE8958-ARIN",
"rel": "self",
"type": "application/rdap+json",
"value": "https://rdap.arin.net/registry/autnum/2381"
},
{
"href": "https://whois.arin.net/rest/poc/ABUSE8958-ARIN",
"rel": "alternate",
"type": "application/xml",
"value": "https://rdap.arin.net/registry/autnum/2381"
}
],
"objectClassName": "entity",
"port43": "whois.arin.net",
"roles": [
"abuse"
],
"status": [
"validated"
],
"vcardArray": [
"vcard",
[
[
"version",
[],
"text",
"4.0"
],
[
"adr",
{
"label": "605 Science Dr\nMadison\nWI\n53711\nUnited States"
},
"text",
[
"",
"",
"",
"",
"",
"",
""
]
],
[
"fn",
[],
"text",
"Abuse"
],
[
"org",
[],
"text",
"WiscNet"
],
[
"kind",
[],
"text",
"group"
],
[
"email",
[],
"text",
"[email protected]"
],
[
"tel",
{
"type": [
"work",
"voice"
]
},
"text",
"+1-608-442-6761;ext2"
]
]
]
},
{
"events": [
{
"eventAction": "last changed",
"eventDate": "2025-12-16T14:46:12-05:00"
},
{
"eventAction": "registration",
"eventDate": "1997-09-17T10:34:04-04:00"
}
],
"handle": "WN29-ORG-ARIN",
"links": [
{
"href": "https://rdap.arin.net/registry/entity/WN29-ORG-ARIN",
"rel": "self",
"type": "application/rdap+json",
"value": "https://rdap.arin.net/registry/autnum/2381"
},
{
"href": "https://whois.arin.net/rest/poc/WN29-ORG-ARIN",
"rel": "alternate",
"type": "application/xml",
"value": "https://rdap.arin.net/registry/autnum/2381"
}
],
"objectClassName": "entity",
"port43": "whois.arin.net",
"roles": [
"technical"
],
"status": [
"validated"
],
"vcardArray": [
"vcard",
[
[
"version",
[],
"text",
"4.0"
],
[
"adr",
{
"label": "605 Science Drive\nMadison\nWI\n53711\nUnited States"
},
"text",
[
"",
"",
"",
"",
"",
"",
""
]
],
[
"fn",
[],
"text",
"WiscNet NIC"
],
[
"org",
[],
"text",
"WiscNet"
],
[
"kind",
[],
"text",
"group"
],
[
"email",
[],
"text",
"[email protected]"
],
[
"tel",
{
"type": [
"work",
"voice"
]
},
"text",
"+1-608-442-6761;ext2"
],
[
"tel",
{
"type": [
"work",
"fax"
]
},
"text",
"+1-608-210-3979"
]
]
]
}
],
"events": [
{
"eventAction": "last changed",
"eventDate": "2024-02-28T09:07:44-05:00"
},
{
"eventAction": "registration",
"eventDate": "1993-02-03T00:00:00-05:00"
}
],
"handle": "AS2381",
"links": [
{
"href": "https://rdap.arin.net/registry/autnum/2381",
"rel": "self",
"type": "application/rdap+json",
"value": "https://rdap.arin.net/registry/autnum/2381"
},
{
"href": "https://whois.arin.net/rest/asn/AS2381",
"rel": "alternate",
"type": "application/xml",
"value": "https://rdap.arin.net/registry/autnum/2381"
}
],
"name": "WISCNET1-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/2381"
}
],
"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/2381"
}
],
"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": 2381,
"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.