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AS409Air Force Systems Networking

United StatesRegistryARIN

As of 13th October 2026, AS409 (Air Force Systems Networking), a network registered in the United States with ARIN, originates 13 IPv4 prefixes covering 271k addresses. By IPv4 address space that makes it the 1,049th-largest of the 79,585 networks we see originating IPv4, and the 276th-largest of 18,443 in the United States. It is seen behind 1 upstream network, most often AS27066 (United States Department of Defense…). None of its announcements have a valid RPKI ROA. 100% of its routes reach at least 90% of full-feed peers.

At a glance

IPv4 prefixes

13

IPv6 prefixes

0

IPv4 addresses

271k

IPv6 /64s

0

Upstream graph

The networks AS409 is seen behind, one and two hops out, drawn from real AS paths.

AS409Toward the internet core
Upstream graph for AS409: 2 neighbouring networks observed beyond it across 2 levels. The same networks are listed in the tables below.AS409Air Force Systems…This networkAS27066United States Dep…AS721United States Dep…

Networks observed one and two hops upstream of AS409 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 AS409
NetworkCountryRelationshipPathsVantage pts
AS27066United States Department of Defense (DoD)USPeer1,04181

Prefixes

The largest blocks AS409 originates, widest first.

Largest prefixes originated by AS409
PrefixAddressesVisibility
131.36.0.0/1665.5k80/81
131.47.0.0/1665.5k80/81
132.15.0.0/1665.5k80/81
132.20.0.0/1665.5k80/81
128.216.0.0/204.1k80/81
143.140.64.0/212k80/81
132.3.8.0/221k81/81
131.36.116.0/2425680/81
131.47.100.0/2425680/81
131.47.106.0/2425680/81

Routing health

How AS409'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

  • Valid0.0%0
  • Invalid0.0%0
  • No ROA100.0%13

Propagation

  • Globally propagated90% of full-feed peers or more100.0%13
  • Partially propagated40% to 90%0.0%0
  • Seen by few peersUnder 40%0.0%0

Prefix sizes

IPv4 — 13 prefixes

Recent changes

Announcements that started or stopped since 13th Sept 2026.

No announcement by AS409 started or stopped in this period.

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