AS131 University of California, Santa Barbara

UCSB-NET-AS - University of California, Santa Barbara · registered in the United States

IPv4 addresses132,1007 prefixes · 0.004% of announced IPv4

Rank in United States#473largest network in US by IPv4 space, of 18,338 · <0.01% of US

Rank worldwide#1,496of 79,396 networks with IPv4

IPv61 x /32 (65,536 x /48)3 prefixes

CountryUnited States18,679 ASNs registered there

Open AS131 in ASN lookup Look up an IP in this network (128.111.0.1) All networks in United States

IPv4 prefixes

All 7 prefixes, in address order.

128.111.0.0/16
137.164.23.8/31
137.164.23.90/31
169.231.0.0/16
192.35.222.0/24
192.150.216.0/23
199.120.153.0/24

IPv6 prefixes

All 3 prefixes.

2607:f378::/32
2607:f380:1::118:9a41:7080/123
2607:f380:1::118:9a41:75a0/123

Similar-sized networks in United States

ASNNameIPv4 addresses

AS11857#470 AEGONUSA - Money Services, Inc.132,608

AS11188#471 LACOUNTY-ISD - LOS ANGELES COUNTY - INTERNAL SERVICESDIVISION132,354

AS1970#472 TAMUS-NET - Texas A&M University132,352

AS7859#474 PAIR-NETWORKS - pair Networks132,096

AS54489#475 CORESPACE-DAL - CoreSpace, Inc.132,096

AS13506#476 US-DEPARTMENT-OF-THE-TREASURY - United States Department of the Treasury132,096

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