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AS399
AS399 Air Force Systems Networking
AFCONC-BLOCK1-AS - Air Force Systems Networking · registered in the United States
IPv4 addresses 153,600 19 prefixes · 0.005% of announced IPv4
Rank in United States #400 largest network in US by IPv4 space, of 18,338 · 0.01% of US
Rank worldwide #1,301 of 79,396 networks with IPv4
IPv6 none no IPv6 routes announced
IPv4 prefixes
All 19 prefixes, in address order.
131.38.0.0/18 131.38.64.0/19 131.38.96.0/20 131.38.112.0/21 131.38.120.0/24 131.38.121.0/24 131.38.122.0/23 131.38.124.0/22 131.38.128.0/17 131.49.0.0/16 132.3.0.0/22 132.7.19.0/24 132.7.47.0/24 132.7.156.0/24 134.165.116.0/24 143.146.192.0/19 143.147.80.0/21 143.156.192.0/19 143.157.80.0/21
Other ASNs named Air Force Systems Networking
17 other networks use the same organisation name; together with AS399 they announce 883,200 IPv4 addresses.
ASN Name IPv4 addresses
AS391 AFCONC-BLOCK1-AS - Air Force Systems Networking US 283,648 AS409 AFCONC-BLOCK1-AS - Air Force Systems Networking US 269,312 AS427 AFCONC-BLOCK1-AS - Air Force Systems Networking US 133,120 AS745 AFCONC-BLOCK2-AS - Air Force Systems Networking US 33,280 AS485 AFCONC-BLOCK1-AS - Air Force Systems Networking US 2,304 AS400 AFCONC-BLOCK1-AS - Air Force Systems Networking US 2,048 AS500 AFCONC-BLOCK1-AS - Air Force Systems Networking US 1,536 AS501 AFCONC-BLOCK1-AS - Air Force Systems Networking US 1,024 AS65 AF-RASN-65 - Air Force Systems Networking US 512 AS406 AFCONC-BLOCK1-AS - Air Force Systems Networking US 512 AS467 AFCONC-BLOCK1-AS - Air Force Systems Networking US 512 AS468 AFCONC-BLOCK1-AS - Air Force Systems Networking US 512 AS384 AFCONC-BLOCK1-AS - Air Force Systems Networking US 256 AS405 AFCONC-BLOCK1-AS - Air Force Systems Networking US 256 AS408 AFCONC-BLOCK1-AS - Air Force Systems Networking US 256 AS461 AFCONC-BLOCK1-AS - Air Force Systems Networking US 256 AS463 AFCONC-BLOCK1-AS - Air Force Systems Networking US 256
Similar-sized networks in United States
ASN Name IPv4 addresses
AS8796 #397 FD-298-8796 - FASTNET DATA INC154,880 AS195 #398 SDSC-AS - San Diego Supercomputer Center154,447 AS14041 #399 AS-FRGP - University Corporation for Atmospheric Research153,600 AS22709 #401 NSTELCO - North State Telephone, LLC152,832 AS30633 #402 LEASEWEB-USA-WDC - Leaseweb USA, Inc.152,064 AS23520 #403 LIBERTY-NETWORKS - Columbus Networks USA, Inc.152,064
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