AS166 Institute for Defense Analyses

IDA-AS - Institute for Defense Analyses · registered in the United States

IPv4 addresses131,32830 prefixes · 0.004% of announced IPv4

Rank in United States#497largest network in US by IPv4 space, of 18,338 · <0.01% of US

Rank worldwide#1,534of 79,396 networks with IPv4

IPv6noneno IPv6 routes announced

CountryUnited States18,679 ASNs registered there

Open AS166 in ASN lookup Look up an IP in this network (129.246.0.1) All networks in United States

IPv4 prefixes

All 30 prefixes, in address order.

129.246.0.0/18
129.246.64.0/19
129.246.96.0/22
129.246.100.0/23
129.246.102.0/23
129.246.104.0/21
129.246.112.0/20
129.246.128.0/18
129.246.192.0/19
129.246.224.0/23
129.246.226.0/23
129.246.228.0/23
129.246.230.0/24
129.246.231.0/24
129.246.232.0/22
129.246.236.0/22
129.246.240.0/22
129.246.244.0/22
129.246.248.0/21
164.217.0.0/17
164.217.128.0/18
164.217.192.0/19
164.217.224.0/23
164.217.226.0/23
164.217.228.0/24
164.217.229.0/24
164.217.230.0/23
164.217.232.0/21
164.217.240.0/20
198.133.241.0/24

Other ASNs named Institute for Defense Analyses

1 other network uses the same organisation name; together with AS166 they announce 131,584 IPv4 addresses.

ASNNameIPv4 addresses

AS398948CCRWEST-AS - Institute for Defense Analyses US256

Similar-sized networks in United States

ASNNameIPv4 addresses

AS53828#494 NITEL - NETWORK INNOVATIONS, LLC131,328

AS4185#495 ATTIS-ASN4185 - AT&T Enterprises, LLC131,328

AS6200#496 UIC-AS - University of Illinois Chicago131,328

AS1563#498 DNIC-ASBLK-01550-01601 - United States Department of Defense (DoD)131,328

AS2024#499 NU - Eversource Energy131,328

AS13695#500 AEP - American Electirc Power Co.131,328

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