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AS306United States Department of Defense (DoD)

United StatesRegistryARINTypeCarrier

As of 22nd October 2026, AS306 (United States Department of Defense…), a transit carrier registered in the United States with ARIN, originates 275 IPv4 prefixes covering 4.7M addresses and 57 IPv6 prefixes. By IPv4 address space that makes it the 142nd-largest of the 79,655 networks we see originating IPv4, and the 41st-largest of 18,475 in the United States. It is seen behind 3 upstream networks, most often AS1540 (Headquarters, USAISC) and AS367 (United States Department of Defense…), and in front of 55 downstream networks. 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

275

IPv6 prefixes

57

IPv4 addresses

4.7M

IPv6 /64s

37.2M

Upstream graph

The networks AS306 is seen behind, one and two hops out, drawn from real AS paths.

AS306Toward the internet core
Upstream graph for AS306: 6 neighbouring networks observed beyond it across 2 levels. The same networks are listed in the tables below.AS306United States Dep…This networkAS367United States Dep…AS1540Headquarters, USA…AS27066United States Dep…AS27065United States Dep…AS27064Defense Informati…AS721United States Dep…

Networks observed one and two hops upstream of AS306 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

116

adjacent networks

Upstreams
33%
Peers
5850%
Downstreams
5547%

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

Upstreams of AS306
NetworkCountryRelationshipPathsVantage pts
AS1540Headquarters, USAISCUSPeer129,716140
AS367United States Department of Defense (DoD)USPeer357140
AS27066United States Department of Defense (DoD)USPeer7777

Prefixes

All 332

The largest blocks AS306 originates, widest first.

Largest prefixes originated by AS306
PrefixAddressesVisibility
55.10.0.0/1665.5k77/77
55.15.0.0/1665.5k77/77
55.17.0.0/1665.5k77/77
55.38.0.0/1665.5k77/77
55.44.0.0/1665.5k77/77
55.51.0.0/1665.5k77/77
55.61.0.0/1665.5k77/77
55.68.0.0/1665.5k77/77
55.85.0.0/1665.5k77/77
55.194.0.0/1665.5k77/77

Routing health

How AS306'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%332

Propagation

  • Globally propagated90% of full-feed peers or more100.0%332
  • Partially propagated40% to 90%0.0%0
  • Seen by few peersUnder 40%0.0%0

Prefix sizes

IPv4 — 275 prefixes

IPv6 — 57 prefixes

  • /4016.8M × /643.5%2
  • /4865.5k × /6496.5%55

Recent changes

Announcements that started or stopped since 22nd Sept 2026.

13 announced and 6 withdrawn in all; the most recent are shown.

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