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AS370United States Department of Defense (DoD)

United StatesRegistryARIN

As of 22nd October 2026, AS370 (United States Department of Defense…), a network registered in the United States with ARIN, originates 138 IPv4 prefixes covering 299k addresses and 1 IPv6 prefix. By IPv4 address space that makes it the 978th-largest of the 79,663 networks we see originating IPv4, and the 252nd-largest of 18,476 in the United States. It is seen behind 2 upstream networks, most often AS306 (United States Department of Defense…) and 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

138

IPv6 prefixes

1

IPv4 addresses

299k

IPv6 /64s

16.8M

Upstream graph

The networks AS370 is seen behind, one and two hops out, drawn from real AS paths.

AS370Toward the internet core
Upstream graph for AS370: 6 neighbouring networks observed beyond it across 2 levels. The same networks are listed in the tables below.AS370United States Dep…This networkAS306United States Dep…AS27064Defense Informati…AS367United States Dep…AS1540Headquarters, USA…AS721United States Dep…AS27065United States Dep…

Networks observed one and two hops upstream of AS370 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

4

adjacent networks

Upstreams
250%
Peers
250%
Downstreams
00%

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

Upstreams of AS370
NetworkCountryRelationshipPathsVantage pts
AS306United States Department of Defense (DoD)USPeer10,612140
AS27064Defense Information Systems Agency (DISA)USPeer7777

Prefixes

All 139

The largest blocks AS370 originates, widest first.

Largest prefixes originated by AS370
PrefixAddressesVisibility
55.54.0.0/1665.5k77/77
55.79.0.0/1665.5k77/77
55.93.0.0/1665.5k77/77
55.100.0.0/1665.5k77/77
139.244.72.0/212k77/77
55.93.128.0/221k77/77
55.54.204.0/2425677/77
55.54.205.0/2425677/77
55.54.210.0/2425677/77
55.54.211.0/2425677/77

Routing health

How AS370'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%139

Propagation

  • Globally propagated90% of full-feed peers or more100.0%139
  • Partially propagated40% to 90%0.0%0
  • Seen by few peersUnder 40%0.0%0

Prefix sizes

IPv4 — 138 prefixes

IPv6 — 1 prefixes

  • /4016.8M × /64100.0%1

Recent changes

Announcements that started or stopped since 23rd Sept 2026.

16 announced and 16 withdrawn in all; the most recent are shown.

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