AS59 University of Wisconsin Madison

WISC-MADISON-AS - University of Wisconsin Madison · registered in the United States

IPv4 addresses331,00433 prefixes · 0.011% of announced IPv4

Rank in United States#208largest network in US by IPv4 space, of 18,338 · 0.02% of US

Rank worldwide#744of 79,396 networks with IPv4

IPv61 x /32 (65,536 x /48)1 prefixes

CountryUnited States18,679 ASNs registered there

Open AS59 in ASN lookup Look up an IP in this network (72.33.0.1) All networks in United States

IPv4 prefixes

All 33 prefixes, in address order.

72.33.0.0/16
128.104.0.0/16
128.105.0.0/18
128.105.64.0/22
128.105.68.0/23
128.105.70.0/23
128.105.72.0/21
128.105.80.0/20
128.105.96.0/19
128.105.128.0/17
144.92.0.0/17
144.92.128.0/18
144.92.192.0/19
144.92.224.0/21
144.92.232.0/24
144.92.233.0/26
144.92.233.64/27
144.92.233.96/28
144.92.233.112/30
144.92.233.120/29
144.92.233.128/25
144.92.234.0/23
144.92.236.0/22
144.92.240.0/20
146.151.0.0/16
192.12.220.0/24
192.12.223.0/24
192.12.224.0/24
192.86.79.0/24
198.51.246.0/23
198.51.254.0/24
198.133.224.0/23
205.213.248.0/22

IPv6 prefixes

All 1 prefix.

2607:f388::/32

Similar-sized networks in United States

ASNNameIPv4 addresses

AS30600#205 AS-CMN - Metronet340,224

AS33654#206 CMCS - Comcast Cable Communications, LLC337,920

AS14638#207 LCPRL - Liberty Communications of Puerto Rico LLC333,824

AS91#209 RPI-AS - Rensselaer Polytechnic Institute330,496

AS32#210 STANFORD - Stanford University329,728

AS35916#211 MULTA-ASN1 - MULTACOM CORPORATION329,727

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