AS38 University of Illinois

UIUC - University of Illinois · registered in the United States

IPv4 addresses210,94416 prefixes · 0.007% of announced IPv4

Rank in United States#308largest network in US by IPv4 space, of 18,338 · 0.02% of US

Rank worldwide#1,041of 79,396 networks with IPv4

IPv616 x /32 (1,048,578 x /48)2 prefixes

CountryUnited States18,679 ASNs registered there

Open AS38 in ASN lookup Look up an IP in this network (72.36.64.1) All networks in United States

IPv4 prefixes

All 16 prefixes, in address order.

72.36.64.0/20
72.36.80.0/23
72.36.82.0/23
72.36.84.0/22
72.36.88.0/21
72.36.96.0/24
72.36.97.0/26
72.36.97.64/26
72.36.97.128/25
72.36.98.0/23
72.36.100.0/22
72.36.104.0/21
72.36.112.0/21
128.174.0.0/16
130.126.0.0/16
192.17.0.0/16

IPv6 prefixes

All 2 prefixes.

2600:3900::/28
2620:0:e00::/47

Other ASNs named University of Illinois

4 other networks use the same organisation name; together with AS38 they announce 291,580 IPv4 addresses.

ASNNameIPv4 addresses

AS1224NCSA-AS - University of Illinois US65,792

AS698ASN-UIUC-REGION-AS - University of Illinois US12,288

AS40387UI-ICCN - University of Illinois US2,044

AS10764STARTAP - University of Illinois US512

Similar-sized networks in United States

ASNNameIPv4 addresses

AS55256#305 NETSKOPE - Netskope Inc212,224

AS22552#306 ESITED - eSited Solutions211,712

AS2055#307 LSU - Louisiana State University211,456

AS10846#309 DEERE - Deere & Company209,152

AS14#310 COLUMBIA-GW - Columbia University208,896

AS7896#311 NU-AS - The Board of Regents of the University of Nebraska208,640

IP-to-ASN data: iptoasn.com (public domain). Snapshot downloaded 2026-11-11, refreshed daily. Ranges are what each network announces in BGP, not registry allocations. Data sources