AS40623 Office of Oceanic and Atmospheric Research - Geophysical Fluid Dynamics Laboratory

GFDL - Office of Oceanic and Atmospheric Research - Geophysical Fluid Dynamics Laboratory · registered in the United States

IPv4 addresses20,4802 prefixes · <0.001% of announced IPv4

Rank in United States#2,111largest network in US by IPv4 space, of 18,338 · <0.01% of US

Rank worldwide#6,075of 79,396 networks with IPv4

IPv617 x /482 prefixes

CountryUnited States18,679 ASNs registered there

Open AS40623 in ASN lookup Look up an IP in this network (140.208.0.1) All networks in United States

IPv4 prefixes

All 2 prefixes, in address order.

140.208.0.0/18
140.208.144.0/20

IPv6 prefixes

All 2 prefixes.

2610:20:8020::/44
2610:20:9120::/48

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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