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AS21556
AS21556 National Aeronautics and Space Administration
NARC-EROOT - National Aeronautics and Space Administration · registered in the United States
IPv4 addresses 512 2 prefixes · <0.001% of announced IPv4
Rank in United States #10,350 largest network in US by IPv4 space, of 18,338 · <0.01% of US
Rank worldwide #48,017 of 79,396 networks with IPv4
IPv6 2 x /48 2 prefixes
IPv4 prefixes
All 2 prefixes, in address order.
192.12.28.0/24 192.203.230.0/24
IPv6 prefixes
All 2 prefixes.
2001:500:a8::/48 2620:126:e000::/48
Other ASNs named National Aeronautics and Space Administration
8 other networks use the same organisation name; together with AS21556 they announce 2,839,554 IPv4 addresses.
ASN Name IPv4 addresses
AS270 AS270 - National Aeronautics and Space Administration US 1,859,328 AS297 AS297 - National Aeronautics and Space Administration US 649,472 AS1701 AS1701 - National Aeronautics and Space Administration US 131,072 AS10343 AS10343 - National Aeronautics and Space Administration US 123,904 AS24 AS24 - National Aeronautics and Space Administration US 65,538 AS1848 AS1848 - National Aeronautics and Space Administration US 6,144 AS372 AS372 - National Aeronautics and Space Administration US 1,792 AS2143 AS2143 - National Aeronautics and Space Administration US 1,792
Similar-sized networks in United States
ASN Name IPv4 addresses
AS18956 #10347 LLAMA-NETWORKS-01 - Llama Networks LLC512 AS19843 #10348 PROSPERMARKETPLACE - Prosper Marketplace, Inc512 AS20417 #10349 STABILISERVERS - StabiliServers512 AS23239 #10351 JAVELINA - Irongrove LLC512 AS23372 #10352 FDIX-PUBLIC - Midwest Internet Exchange LLC512 AS26021 #10353 AS-DNS3 - Unicycle, LLC512
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