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AS1501Headquarters, USAISC

United StatesRegistryARIN

As of 22nd October 2026, AS1501 (Headquarters, USAISC), a network registered in the United States with ARIN, originates 139 IPv4 prefixes covering 51.2k addresses. By IPv4 address space that makes it the 4,393rd-largest of the 79,655 networks we see originating IPv4, and the 1,569th-largest of 18,475 in the United States. It is seen behind 1 upstream network, most often AS1555 (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

139

IPv6 prefixes

0

IPv4 addresses

51.2k

IPv6 /64s

0

Upstream graph

The networks AS1501 is seen behind, one and two hops out, drawn from real AS paths.

AS1501Toward the internet core
Upstream graph for AS1501: 2 neighbouring networks observed beyond it across 2 levels. The same networks are listed in the tables below.AS1501Headquarters, USA…This networkAS1555United States Dep…AS1554United States Dep…

Networks observed one and two hops upstream of AS1501 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 AS1501
NetworkCountryRelationshipPathsVantage pts
AS1555United States Department of Defense (DoD)USPeer10,68677

Prefixes

All 139

The largest blocks AS1501 originates, widest first.

Largest prefixes originated by AS1501
PrefixAddressesVisibility
143.249.96.0/204.1k77/77
150.196.240.0/204.1k77/77
155.26.224.0/204.1k77/77
150.196.240.0/212k77/77
143.70.4.0/221k77/77
147.104.100.0/221k77/77
143.194.128.0/2351277/77
155.26.48.0/2351277/77
158.11.208.0/2351277/77
136.210.224.0/2425677/77

Routing health

How AS1501'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 more99.3%138
  • Partially propagated40% to 90%0.7%1
  • Seen by few peersUnder 40%0.0%0

Prefix sizes

IPv4 — 139 prefixes

Recent changes

Announcements that started or stopped since 22nd Sept 2026.

213 announced and 209 withdrawn in all; the most recent are shown.

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