AS20 University of Rochester

UR - University of Rochester · registered in the United States

IPv4 addresses66,0483 prefixes · 0.002% of announced IPv4

Rank in United States#903largest network in US by IPv4 space, of 18,338 · <0.01% of US

Rank worldwide#2,709of 79,396 networks with IPv4

IPv6256 x /481 prefixes

CountryUnited States18,679 ASNs registered there

Open AS20 in ASN lookup Look up an IP in this network (128.151.0.1) All networks in United States

IPv4 prefixes

All 3 prefixes, in address order.

128.151.0.0/16
192.5.53.0/24
199.89.214.0/24

IPv6 prefixes

All 1 prefix.

2620:107:a000::/40

Similar-sized networks in United States

ASNNameIPv4 addresses

AS55194#900 BGSU - Bowling Green State University66,048

AS398663#901 SHIPPENSBURG-UNIVERSITY-01 - Shippensburg University66,048

AS398813#902 MILLERSVILLE-UNIVERSITY - Millersville University of Pennsylvania66,048

AS102#904 NSF-HQ-AS - U.S. National Science Foundation66,048

AS317#905 DNIC-ASBLK-00306-00371 - United States Department of Defense (DoD)66,048

AS11279#906 GEORGE-MASON-UNIV - George Mason University66,048

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