AS4 University of Southern California

ISI-AS - University of Southern California · registered in the United States

IPv4 addresses65,53627 prefixes · 0.002% of announced IPv4

Rank in United States#995largest network in US by IPv4 space, of 18,338 · <0.01% of US

Rank worldwide#2,858of 79,396 networks with IPv4

IPv62 x /32 (131,077 x /48)6 prefixes

CountryUnited States18,679 ASNs registered there

Open AS4 in ASN lookup Look up an IP in this network (128.9.0.1) All networks in United States

IPv4 prefixes

All 27 prefixes, in address order.

128.9.0.0/20
128.9.16.0/22
128.9.26.0/24
128.9.28.0/22
128.9.32.0/22
128.9.36.0/23
128.9.38.0/24
128.9.39.0/24
128.9.40.0/24
128.9.41.0/24
128.9.42.0/23
128.9.44.0/22
128.9.48.0/20
128.9.64.0/19
128.9.96.0/20
128.9.112.0/23
128.9.114.0/23
128.9.116.0/23
128.9.118.0/23
128.9.120.0/21
128.9.128.0/17
170.79.218.0/23
198.32.16.0/24
206.117.6.0/24
206.117.27.0/24
206.117.31.0/24
206.117.37.0/24

IPv6 prefixes

All 6 prefixes.

2001:500:202::/48
2001:1878:401::/48
2001:1878:402::/47
2001:1878:404::/48
2606:d5c0::/32
2804:3edc::/32

Other ASNs named University of Southern California

1 other network uses the same organisation name; together with AS4 they announce 132,608 IPv4 addresses.

ASNNameIPv4 addresses

AS47USC-AS - University of Southern California US67,072

Similar-sized networks in United States

ASNNameIPv4 addresses

AS24#992 AS24 - National Aeronautics and Space Administration65,538

AS400452#993 UC-DAVIS-HEALTH - University of California Davis Medical Center65,538

AS10294#994 CCCD-AS - Coast Community College District65,538

AS393601#996 SMOA-STATEOFMISSOURI-01 - State of Missouri Office of Administration65,536

AS17234#997 GAC - Gustavus Adolphus College65,536

AS92#998 CLARKSON-AS - Clarkson University65,536

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