AS26397 The Regents of the University of California - University of California, San Diego.

OPTIPUTER - The Regents of the University of California - University of California, San Diego. · registered in the United States

IPv4 addresses6,76811 prefixes · <0.001% of announced IPv4

Rank in United States#3,651largest network in US by IPv4 space, of 18,338 · <0.01% of US

Rank worldwide#11,761of 79,396 networks with IPv4

IPv618,446,744,073,709,551,616 addresses (smaller than a /48)1 prefixes

CountryUnited States18,679 ASNs registered there

Open AS26397 in ASN lookup Look up an IP in this network (67.58.32.1) All networks in United States

IPv4 prefixes

All 11 prefixes, in address order.

67.58.32.0/20
67.58.48.0/22
67.58.52.0/24
67.58.53.0/25
67.58.53.128/28
67.58.53.160/27
67.58.53.192/26
67.58.54.0/25
67.58.55.0/24
169.228.130.0/23
169.228.132.0/24

IPv6 prefixes

All 1 prefix.

2607:f720:1700:1b30::/64

Other ASNs named The Regents of the University of California - University of California, San Diego.

1 other network uses the same organisation name; together with AS26397 they announce 11,634 IPv4 addresses.

ASNNameIPv4 addresses

AS46985HPWREN - The Regents of the University of California - University of California, San Diego. US4,866

Similar-sized networks in United States

ASNNameIPv4 addresses

AS63296#3648 AWBROADBAND - Amarillo Wireless6,912

AS396206#3649 FRANCISCANALLIANCE - Franciscan Alliance Inc6,912

AS399130#3650 ISPWIFI - Ispwifi6,912

AS36057#3652 WEBAIR-INTERNET-MTL - Webair Internet Development Company Inc.6,656

AS397324#3653 GWI-CI-ASN - Gallatin Wireless Internet, LLC6,656

AS14877#3654 FL-14877 - FirstLight Fiber, Inc.6,656

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