AS30387 National Institutes of Health

NIH-NET-NCCS - National Institutes of Health · registered in the United States

IPv4 addresses8,44814 prefixes · <0.001% of announced IPv4

Rank in United States#3,225largest network in US by IPv4 space, of 18,338 · <0.01% of US

Rank worldwide#10,100of 79,396 networks with IPv4

IPv6noneno IPv6 routes announced

CountryUnited States18,679 ASNs registered there

Open AS30387 in ASN lookup Look up an IP in this network (156.40.53.1) All networks in United States

IPv4 prefixes

All 14 prefixes, in address order.

156.40.53.0/24
156.40.98.0/23
165.112.0.0/22
165.112.4.0/23
165.112.12.0/22
165.112.32.0/23
165.112.124.0/23
165.112.127.0/24
165.112.136.0/22
165.112.141.0/24
165.112.142.0/23
165.112.194.0/23
165.112.200.0/22
165.112.252.0/23

Other ASNs named National Institutes of Health

1 other network uses the same organisation name; together with AS30387 they announce 333,056 IPv4 addresses.

ASNNameIPv4 addresses

AS3527NIH-NET - National Institutes of Health US324,608

Similar-sized networks in United States

ASNNameIPv4 addresses

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AS30219#3224 MLB-ADVANCED-MEDIA - Major League Baseball Advanced Media, LP8,448

AS30436#3226 ELITE-BROADBAND - Elite Broadband LLC8,448

AS31766#3227 UPS-12-ASN - University of Puget Sound8,448

AS31929#3228 GREATRIVERENERGY - Great River Energy8,448

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