subnet.im

AS391Air Force Systems Networking

United StatesRegistryARIN

As of 22nd October 2026, AS391 (Air Force Systems Networking), a network registered in the United States with ARIN, originates 40 IPv4 prefixes covering 286k addresses. By IPv4 address space that makes it the 1,011th-largest of the 79,655 networks we see originating IPv4, and the 265th-largest of 18,475 in the United States. It is seen behind 1 upstream network, most often AS27064 (Defense Information Systems Agency…). 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

40

IPv6 prefixes

0

IPv4 addresses

286k

IPv6 /64s

0

Upstream graph

The networks AS391 is seen behind, one and two hops out, drawn from real AS paths.

AS391Toward the internet core
Upstream graph for AS391: 2 neighbouring networks observed beyond it across 2 levels. The same networks are listed in the tables below.AS391Air Force Systems…This networkAS27064Defense Informati…AS721United States Dep…

Networks observed one and two hops upstream of AS391 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 AS391
NetworkCountryRelationshipPathsVantage pts
AS27064Defense Information Systems Agency (DISA)USPeer3,08077

Prefixes

All 40

The largest blocks AS391 originates, widest first.

Largest prefixes originated by AS391
PrefixAddressesVisibility
128.202.0.0/1665.5k77/77
128.236.0.0/1665.5k77/77
137.0.0.0/1665.5k77/77
137.11.0.0/1665.5k77/77
131.15.48.0/204.1k77/77
131.15.64.0/204.1k77/77
131.15.40.0/212k77/77
131.15.144.0/212k77/77
131.15.160.0/212k77/77
143.141.96.0/221k77/77

Routing health

How AS391'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%40

Propagation

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

Prefix sizes

IPv4 — 40 prefixes

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.