AS91 Rensselaer Polytechnic Institute

RPI-AS - Rensselaer Polytechnic Institute · registered in the United States

IPv4 addresses330,49611 prefixes · 0.011% of announced IPv4

Rank in United States#209largest network in US by IPv4 space, of 18,338 · 0.02% of US

Rank worldwide#746of 79,396 networks with IPv4

IPv62 x /482 prefixes

CountryUnited States18,679 ASNs registered there

Open AS91 in ASN lookup Look up an IP in this network (128.113.0.1) All networks in United States

IPv4 prefixes

All 11 prefixes, in address order.

128.113.0.0/16
128.213.0.0/16
129.5.0.0/16
129.161.0.0/16
146.8.0.0/16
192.12.91.0/24
192.12.92.0/24
204.76.222.0/23
204.76.224.0/22
204.76.228.0/23
204.145.205.0/24

IPv6 prefixes

All 2 prefixes.

2620:0:bf0::/48
2620:0:2820::/48

Similar-sized networks in United States

ASNNameIPv4 addresses

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

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

AS59#208 WISC-MADISON-AS - University of Wisconsin Madison331,004

AS32#210 STANFORD - Stanford University329,728

AS35916#211 MULTA-ASN1 - MULTACOM CORPORATION329,727

AS32475#212 SINGLEHOP-LLC - Internap Holding LLC329,216

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