AS2003 Electric Power Research Institute

EPRI-PA - Electric Power Research Institute · registered in the United States

IPv4 addresses26,62416 prefixes · <0.001% of announced IPv4

Rank in United States#1,876largest network in US by IPv4 space, of 18,338 · <0.01% of US

Rank worldwide#5,296of 79,396 networks with IPv4

IPv6noneno IPv6 routes announced

CountryUnited States18,679 ASNs registered there

Open AS2003 in ASN lookup Look up an IP in this network (144.58.0.1) All networks in United States

IPv4 prefixes

All 16 prefixes, in address order.

144.58.0.0/22
144.58.4.0/23
144.58.6.0/24
144.58.40.0/24
144.58.42.0/23
144.58.44.0/23
144.58.46.0/24
144.58.48.0/22
144.58.96.0/22
144.58.112.0/20
144.58.129.0/24
144.58.140.0/24
144.58.144.0/24
144.58.176.0/20
144.58.208.0/20
144.58.224.0/19

Similar-sized networks in United States

ASNNameIPv4 addresses

AS63473#1873 HOSTHATCH - HostHatch, LLC26,624

AS6423#1874 DF-PTL2-3 - Digital Fortress26,624

AS571#1875 DNIC-AS-00571 - United States Department of Defense (DoD)26,624

AS5049#1877 MORGAN-ASN - Morgan Stanley Group Inc.26,624

AS11643#1878 EBAY - eBay, Inc26,624

AS19504#1879 WTCC - WTC Communications, Inc.26,624

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