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AS40623Office of Oceanic and Atmospheric Research - Geophysical Fluid Dynamics Laboratory

United StatesRegistryARIN

As of 22nd October 2026, AS40623 (Office of Oceanic and Atmospheric…), a network registered in the United States with ARIN, originates 2 IPv4 prefixes covering 20.5k addresses and 2 IPv6 prefixes. By IPv4 address space that makes it the 6,948th-largest of the 79,663 networks we see originating IPv4, and the 2,291st-largest of 18,476 in the United States. It is seen behind 1 upstream network, most often AS3477 (National Oceanic and Atmospheric…). Every one of its announcements has a valid RPKI ROA, and none are RPKI-invalid. 100% of its routes reach at least 90% of full-feed peers.

At a glance

IPv4 prefixes

2

IPv6 prefixes

2

IPv4 addresses

20.5k

IPv6 /64s

1.1M

Upstream graph

The networks AS40623 is seen behind, one and two hops out, drawn from real AS paths.

AS40623Toward the internet core
Upstream graph for AS40623: 3 neighbouring networks observed beyond it across 2 levels. The same networks are listed in the tables below.AS40623Office of Oceanic…This networkAS3477National Oceanic …AS11956National Oceanic …AS26100National Oceanic …

Networks observed one and two hops upstream of AS40623 in real AS paths. A thicker line means more vantage points saw that adjacency, so weight tracks how well attested it is — not how much traffic it carries. Adjacency is an observation; whether it is a transit purchase or a settlement-free peering is an inference, and is labelled as one wherever we show it.

Neighbouring networks

2

adjacent networks

Upstreams
150%
Peers
150%
Downstreams
00%

Networks carrying this one's traffic toward the rest of the internet.

Upstreams of AS40623
NetworkCountryRelationshipPathsVantage pts
AS3477National Oceanic and Atmospheric AdministrationUSPeer278139

Prefixes

The largest blocks AS40623 originates, widest first.

Largest prefixes originated by AS40623
PrefixAddressesVisibility
140.208.0.0/1816.4k76/77
140.208.144.0/204.1k76/77
2610:20:8020::/441M × /6463/64
2610:20:9120::/4865.5k × /6463/64

Routing health

How AS40623's own announcements validate against RPKI and how far they propagate. The same measures for the whole routing table are on the routing table in numbers.

RPKI origin validation

  • Valid100.0%4
  • Invalid0.0%0
  • No ROA0.0%0

Propagation

  • Globally propagated90% of full-feed peers or more100.0%4
  • Partially propagated40% to 90%0.0%0
  • Seen by few peersUnder 40%0.0%0

Prefix sizes

IPv4 — 2 prefixes

IPv6 — 2 prefixes

  • /441M × /6450.0%1
  • /4865.5k × /6450.0%1

Recent changes

Announcements that started or stopped since 22nd Sept 2026.

Routing data derived from RouteViews MRT archives, BGPKIT relationship inference and public registry data.