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AS26100National Oceanic and Atmospheric Administration

United StatesRegistryARIN

As of 22nd October 2026, AS26100 (National Oceanic and Atmospheric…), a network registered in the United States with ARIN, originates 3 IPv4 prefixes covering 2.3k addresses. By IPv4 address space that makes it the 24,129th-largest of the 79,655 networks we see originating IPv4, and the 6,046th-largest of 18,475 in the United States. It is seen behind 2 upstream networks, most often AS6360 (University of Hawaii) and AS36149 (Hawaiian Telcom Services Company, Inc.), and in front of 1 downstream network. 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

3

IPv6 prefixes

0

IPv4 addresses

2.3k

IPv6 /64s

0

Upstream graph

The networks AS26100 is seen behind, one and two hops out, drawn from real AS paths.

AS26100Toward the internet core
Upstream graph for AS26100: 5 neighbouring networks observed beyond it across 2 levels. The same networks are listed in the tables below.AS26100National Oceanic …This networkAS6360University of Haw…AS36149Hawaiian Telcom S…AS2152CENIC - CalRENAS6939Hurricane Electri…AS3356Lumen (Level 3)

Networks observed one and two hops upstream of AS26100 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

7

adjacent networks

Upstreams
229%
Peers
457%
Downstreams
114%

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

Upstreams of AS26100
NetworkCountryRelationshipPathsVantage pts
AS6360University of HawaiiUSPeer315140
AS36149Hawaiian Telcom Services Company, Inc.USPeer19666

Prefixes

The largest blocks AS26100 originates, widest first.

Largest prefixes originated by AS26100
PrefixAddressesVisibility
137.75.124.0/221k77/77
205.156.56.0/221k77/77
205.156.60.0/2425677/77

Routing health

How AS26100'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%3
  • Invalid0.0%0
  • No ROA0.0%0

Propagation

  • Globally propagated90% of full-feed peers or more100.0%3
  • Partially propagated40% to 90%0.0%0
  • Seen by few peersUnder 40%0.0%0

Prefix sizes

IPv4 — 3 prefixes

Recent changes

Announcements that started or stopped since 22nd Sept 2026.

No announcement by AS26100 started or stopped in this period.

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