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AS391
AS391 Air Force Systems Networking
AFCONC-BLOCK1-AS - Air Force Systems Networking · registered in the United States
IPv4 addresses 283,648 42 prefixes · 0.009% of announced IPv4
Rank in United States #245 largest network in US by IPv4 space, of 18,338 · 0.02% of US
Rank worldwide #854 of 79,396 networks with IPv4
IPv6 none no IPv6 routes announced
IPv4 prefixes
All 42 prefixes, in address order.
128.202.0.0/16 128.236.0.0/16 131.15.38.0/23 131.15.40.0/22 131.15.44.0/24 131.15.45.0/24 131.15.46.0/24 131.15.48.0/21 131.15.56.0/22 131.15.60.0/24 131.15.61.0/24 131.15.62.0/24 131.15.65.0/24 131.15.68.0/22 131.15.73.0/24 131.15.74.0/23 131.15.76.0/22 131.15.80.0/24 131.15.88.0/24 131.15.90.0/23 131.15.92.0/24 131.15.98.0/23 131.15.120.0/24 131.15.136.0/24 131.15.144.0/21 131.15.160.0/21 131.15.208.0/24 131.15.233.0/24 131.15.234.0/23 131.15.236.0/22 131.15.252.0/23 137.0.0.0/16 137.11.0.0/16 143.141.96.0/22 199.31.2.0/23 199.251.155.0/24 199.251.156.0/24 204.34.211.0/24 206.39.56.0/24 206.39.58.0/24 207.133.179.0/24 207.133.189.0/24
Other ASNs named Air Force Systems Networking
17 other networks use the same organisation name; together with AS391 they announce 883,200 IPv4 addresses.
ASN Name IPv4 addresses
AS409 AFCONC-BLOCK1-AS - Air Force Systems Networking US 269,312 AS399 AFCONC-BLOCK1-AS - Air Force Systems Networking US 153,600 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
AS18186 #242 NEBULA-GLOBAL - Nebula Global LLC285,696 AS8069 #243 MICROSOFT-CORP-MSN-AS-BLOCK - Microsoft Corporation285,184 AS26810 #244 HHSNET-NOC-ASN - U.S. Dept. of Health and Human Services284,416 AS32098 #246 TRANSTELCO-INC - Transtelco Inc281,344 AS22205 #247 DATAPIPE-SEA - DataPipe, Inc.280,320 AS226 #248 LOS-NETTOS-AS - Los Nettos280,320
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