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AS3477National Oceanic and Atmospheric Administration

United StatesRegistryARIN

As of 22nd October 2026, AS3477 (National Oceanic and Atmospheric…), a network registered in the United States with ARIN, originates 87 IPv4 prefixes covering 338k addresses and 26 IPv6 prefixes. By IPv4 address space that makes it the 893rd-largest of the 79,655 networks we see originating IPv4, and the 223rd-largest of 18,475 in the United States. It is seen behind 2 upstream networks, most often AS11956 (National Oceanic and Atmospheric…) and AS26100 (National Oceanic and Atmospheric…), and in front of 10 downstream networks. Every one of its announcements has a valid RPKI ROA, and none are RPKI-invalid. 97% of its routes reach at least 90% of full-feed peers.

At a glance

IPv4 prefixes

87

IPv6 prefixes

26

IPv4 addresses

338k

IPv6 /64s

34.5B

Upstream graph

The networks AS3477 is seen behind, one and two hops out, drawn from real AS paths.

AS3477Toward the internet core
Upstream graph for AS3477: 6 neighbouring networks observed beyond it across 2 levels. The same networks are listed in the tables below.AS3477National Oceanic …This networkAS11956National Oceanic …AS26100National Oceanic …AS10886University of Mar…AS14041University Corpor…AS6360University of Haw…AS36149Hawaiian Telcom S…

Networks observed one and two hops upstream of AS3477 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

24

adjacent networks

Upstreams
28%
Peers
1250%
Downstreams
1042%

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

Upstreams of AS3477
NetworkCountryRelationshipPathsVantage pts
AS11956National Oceanic and Atmospheric AdministrationUSPeer12,463141
AS26100National Oceanic and Atmospheric AdministrationUSPeer280140

Prefixes

All 113

The largest blocks AS3477 originates, widest first.

Largest prefixes originated by AS3477
PrefixAddressesVisibility
140.90.0.0/1665.5k76/77
140.172.0.0/1665.5k77/77
155.206.0.0/1665.5k76/77
161.55.0.0/1665.5k77/77
137.75.64.0/1816.4k77/77
205.156.0.0/1816.4k76/77
198.206.32.0/198.2k76/77
140.208.192.0/204.1k76/77
137.75.88.0/212k76/77
137.75.68.0/221k76/77

Routing health

How AS3477'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%113
  • Invalid0.0%0
  • No ROA0.0%0

Propagation

  • Globally propagated90% of full-feed peers or more97.3%110
  • Partially propagated40% to 90%0.0%0
  • Seen by few peersUnder 40%2.7%3

Prefix sizes

IPv4 — 87 prefixes

IPv6 — 26 prefixes

  • /324.3B × /6430.8%8
  • /3867.1M × /643.8%1
  • /4016.8M × /647.7%2
  • /441M × /6426.9%7
  • /45524k × /643.8%1
  • /46262k × /647.7%2
  • /47131k × /643.8%1
  • /4865.5k × /6415.4%4

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.