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AS56United States Department of Defense (DoD)

United StatesRegistryARIN

As of 22nd October 2026, AS56 (United States Department of Defense…), a network registered in the United States with ARIN, originates 929 IPv4 prefixes covering 8.1M addresses. By IPv4 address space that makes it the 88th-largest of the 79,663 networks we see originating IPv4, and the 27th-largest of 18,476 in the United States. It is seen behind 2 upstream networks, most often AS27064 (Defense Information Systems Agency…) and AS27065 (United States Department of Defense…). None of its announcements have a valid RPKI ROA. Over 99% of its routes reach at least 90% of full-feed peers.

At a glance

IPv4 prefixes

929

IPv6 prefixes

0

IPv4 addresses

8.1M

IPv6 /64s

0

Upstream graph

The networks AS56 is seen behind, one and two hops out, drawn from real AS paths.

AS56Toward the internet core
Upstream graph for AS56: 3 neighbouring networks observed beyond it across 2 levels. The same networks are listed in the tables below.AS56United States Dep…This networkAS27064Defense Informati…AS27065United States Dep…AS721United States Dep…

Networks observed one and two hops upstream of AS56 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 AS56
NetworkCountryRelationshipPathsVantage pts
AS27064Defense Information Systems Agency (DISA)USPeer68,76277
AS27065United States Department of Defense (DoD)USPeer2,69577

Prefixes

All 929

The largest blocks AS56 originates, widest first.

Largest prefixes originated by AS56
PrefixAddressesVisibility
129.48.0.0/1665.5k77/77
129.52.0.0/1665.5k77/77
129.53.0.0/1665.5k77/77
129.54.0.0/1665.5k77/77
129.61.0.0/1665.5k77/77
129.141.0.0/1665.5k77/77
129.198.0.0/1665.5k77/77
129.238.0.0/1665.5k77/77
130.53.0.0/1665.5k77/77
131.3.0.0/1665.5k77/77

Routing health

How AS56'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%929

Propagation

  • Globally propagated90% of full-feed peers or more99.9%928
  • Partially propagated40% to 90%0.0%0
  • Seen by few peersUnder 40%0.1%1

Prefix sizes

IPv4 — 929 prefixes

Recent changes

Announcements that started or stopped since 22nd Sept 2026.

141 announced and 139 withdrawn in all; the most recent are shown.

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