Organization
University of Illinois
UIUC
Registered
Jan 24, 1985
41 years ago
IPv4 Prefixes
4
212,992 addresses
IPv6 Prefixes
3
1M × /48
BGP Neighbours
2
2 upstream/peer · 0 downstream
Registration
AS Number AS38 AS Name UIUC Organization University of Illinois Organization ID UIUC-Z Address 1120 DCL, MC-256, 1304 West Springfield Avenue, Urbana, IL, 61801, United States Country United States (US) Registry ARIN Allocated Jan 24, 1985 Record Created Jan 24, 1985 Last Updated Feb 23, 2022 Status
active
WHOIS Server whois.arin.net AS Description UIUC - University of Illinois, US Abuse Email [email protected] Abuse Phone +1-217-265-0000 IPv4 Prefixes
4 prefixes · 212,992 addresses Routing data as of 2026-10-04 00:00 UTC
| Prefix | Range | Addresses |
|---|---|---|
| 72.36.64.0/18 | 72.36.64.0 – 72.36.127.255 | 16,384 |
| 128.174.0.0/16 | 128.174.0.0 – 128.174.255.255 | 65,536 |
| 130.126.0.0/16 | 130.126.0.0 – 130.126.255.255 | 65,536 |
| 192.17.0.0/16 | 192.17.0.0 – 192.17.255.255 | 65,536 |
IPv6 Prefixes
3 prefixes · 1M × /48 Routing data as of 2026-10-04 00:00 UTC
| Prefix | Addresses |
|---|---|
| 2600:3900:: | 2100 |
| 2620:0:e00:: | 280 |
| 2620:0:e01:: | 280 |
BGP Neighbours
2 unique neighbours · 2 upstream/peer · 0 downstream. A neighbour can be seen on more than one side. Rows are ordered by AS paths: the number of BGP paths seen by RIPE RIS that contain the adjacency. Sightings count each IPv4/IPv6 route with the adjacency once per RIS peer that sees it (routes × peers), so they show how widely it is seen, not how many distinct routes it carries. Networks seen to the left of this AS in BGP paths, toward the route collectors — typically its transit providers (upstreams) and peers. Upstream & peer side (2)
Raw RDAP Response
{
"endAutnum": 38,
"entities": [
{
"entities": [
{
"events": [
{
"eventAction": "last changed",
"eventDate": "2026-04-21T11:48:15-04:00"
},
{
"eventAction": "registration",
"eventDate": "2003-01-17T16:40:57-05:00"
}
],
"handle": "HOSTM159-ARIN",
"links": [
{
"href": "https://rdap.arin.net/registry/entity/HOSTM159-ARIN",
"rel": "self",
"type": "application/rdap+json",
"value": "https://rdap.arin.net/registry/autnum/38"
},
{
"href": "https://whois.arin.net/rest/poc/HOSTM159-ARIN",
"rel": "alternate",
"type": "application/xml",
"value": "https://rdap.arin.net/registry/autnum/38"
}
],
"objectClassName": "entity",
"port43": "whois.arin.net",
"roles": [
"technical",
"administrative"
],
"status": [
"validated"
],
"vcardArray": [
"vcard",
[
[
"version",
{},
"text",
"4.0"
],
[
"adr",
{
"label": "1304 West Springfield Avenue\nUrbana\nIL\n61801\nUnited States"
},
"text",
[
"",
"",
"",
"",
"",
"",
""
]
],
[
"fn",
{},
"text",
"Hostmgr"
],
[
"org",
{},
"text",
"University of Illinois at Urbana-Champaign"
],
[
"kind",
{},
"text",
"group"
],
[
"email",
{},
"text",
"[email protected]"
],
[
"tel",
{
"type": [
"work",
"voice"
]
},
"text",
"+1-217-244-1000"
]
]
]
},
{
"events": [
{
"eventAction": "last changed",
"eventDate": "2026-03-25T14:32:09-04:00"
},
{
"eventAction": "registration",
"eventDate": "2003-12-16T13:02:15-05:00"
}
],
"handle": "UIUCS-ARIN",
"links": [
{
"href": "https://rdap.arin.net/registry/entity/UIUCS-ARIN",
"rel": "self",
"type": "application/rdap+json",
"value": "https://rdap.arin.net/registry/autnum/38"
},
{
"href": "https://whois.arin.net/rest/poc/UIUCS-ARIN",
"rel": "alternate",
"type": "application/xml",
"value": "https://rdap.arin.net/registry/autnum/38"
}
],
"objectClassName": "entity",
"port43": "whois.arin.net",
"roles": [
"abuse"
],
"status": [
"validated"
],
"vcardArray": [
"vcard",
[
[
"version",
{},
"text",
"4.0"
],
[
"adr",
{
"label": "1304 West Springfield Avenue\n2222 DCL, MC-256\nUrbana\nIL\n61801\nUnited States"
},
"text",
[
"",
"",
"",
"",
"",
"",
""
]
],
[
"fn",
{},
"text",
"UIUC Security"
],
[
"org",
{},
"text",
"University of Illinois at Urbana-Champaign"
],
[
"kind",
{},
"text",
"group"
],
[
"email",
{},
"text",
"[email protected]"
],
[
"tel",
{
"type": [
"work",
"voice"
]
},
"text",
"+1-217-265-0000"
]
]
]
}
],
"events": [
{
"eventAction": "last changed",
"eventDate": "2021-11-03T15:53:10-04:00"
},
{
"eventAction": "registration",
"eventDate": "2021-11-03T15:53:10-04:00"
}
],
"handle": "UIUC-Z",
"links": [
{
"href": "https://rdap.arin.net/registry/entity/UIUC-Z",
"rel": "self",
"type": "application/rdap+json",
"value": "https://rdap.arin.net/registry/autnum/38"
},
{
"href": "https://whois.arin.net/rest/org/UIUC-Z",
"rel": "alternate",
"type": "application/xml",
"value": "https://rdap.arin.net/registry/autnum/38"
}
],
"objectClassName": "entity",
"port43": "whois.arin.net",
"roles": [
"registrant"
],
"vcardArray": [
"vcard",
[
[
"version",
{},
"text",
"4.0"
],
[
"fn",
{},
"text",
"University of Illinois"
],
[
"adr",
{
"label": "1120 DCL, MC-256\n1304 West Springfield Avenue\nUrbana\nIL\n61801\nUnited States"
},
"text",
[
"",
"",
"",
"",
"",
"",
""
]
],
[
"kind",
{},
"text",
"org"
]
]
]
}
],
"events": [
{
"eventAction": "last changed",
"eventDate": "2022-02-23T12:09:32-05:00"
},
{
"eventAction": "registration",
"eventDate": "1985-01-24T00:00:00-05:00"
}
],
"handle": "AS38",
"links": [
{
"href": "https://rdap.arin.net/registry/autnum/38",
"rel": "self",
"type": "application/rdap+json",
"value": "https://rdap.arin.net/registry/autnum/38"
},
{
"href": "https://whois.arin.net/rest/asn/AS38",
"rel": "alternate",
"type": "application/xml",
"value": "https://rdap.arin.net/registry/autnum/38"
}
],
"name": "UIUC",
"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/38"
}
],
"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/38"
}
],
"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": 38,
"status": [
"active"
]
} Contact details of private individuals are redacted.