AS12145 Colorado State University

COLORADOSTATEUNIV - Colorado State University · registered in the United States

IPv4 addresses81,6647 prefixes · 0.003% of announced IPv4

Rank in United States#719largest network in US by IPv4 space, of 18,338 · <0.01% of US

Rank worldwide#2,173of 79,396 networks with IPv4

IPv6noneno IPv6 routes announced

CountryUnited States18,679 ASNs registered there

Open AS12145 in ASN lookup Look up an IP in this network (129.19.0.1) All networks in United States

IPv4 prefixes

All 7 prefixes, in address order.

129.19.0.0/22
129.19.4.0/23
129.19.7.0/24
129.19.8.0/21
129.19.16.0/20
129.19.32.0/19
129.82.0.0/16

Other ASNs named Colorado State University

1 other network uses the same organisation name; together with AS12145 they announce 147,200 IPv4 addresses.

ASNNameIPv4 addresses

AS36691CSUP-AS - Colorado State University US65,536

Similar-sized networks in United States

ASNNameIPv4 addresses

AS53785#716 UNC-GREENSBORO - University of North Carolina at Greensboro81,920

AS29873#717 BIZLAND-SD - Newfold Digital, Inc.81,664

AS6569#718 NATIONWIDEASN - Nationwide Mutual Insurance Company81,664

AS62642#720 BIGLEAF - Bigleaf Networks, Inc.81,664

AS23465#721 NUTELECOM - Nuvera81,408

AS26577#722 BAESYSTEMS - BAE Systems Inc.81,408

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