AS20126 University of Cincinnati

UC-DOM - University of Cincinnati · registered in the United States

IPv4 addresses65,5369 prefixes · 0.002% of announced IPv4

Rank in United States#1,181largest network in US by IPv4 space, of 18,338 · <0.01% of US

Rank worldwide#3,223of 79,396 networks with IPv4

IPv6noneno IPv6 routes announced

CountryUnited States18,679 ASNs registered there

Open AS20126 in ASN lookup Look up an IP in this network (129.137.0.1) All networks in United States

IPv4 prefixes

All 9 prefixes, in address order.

129.137.0.0/20
129.137.16.0/21
129.137.24.0/22
129.137.28.0/24
129.137.29.0/24
129.137.30.0/23
129.137.32.0/19
129.137.64.0/18
129.137.128.0/17

Similar-sized networks in United States

ASNNameIPv4 addresses

AS19820#1178 REXAM-ASN01 - Ball Corporation65,536

AS19933#1179 BUFFALOSTATE - Buffalo State College65,536

AS20105#1180 URICHMOND - University of Richmond65,536

AS20162#1182 UTDALLAS - University of Texas at Dallas65,536

AS20239#1183 MNPOWER-ASN - ALLETE, Inc.65,536

AS20343#1184 PEPPERDINE - Pepperdine 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