subnet.im

AS252Headquarters, USAISC

United StatesRegistryARIN

As of 22nd October 2026, AS252 (Headquarters, USAISC), a network registered in the United States with ARIN, originates 5 IPv4 prefixes covering 69.1k addresses and 1 IPv6 prefix. By IPv4 address space that makes it the 3,151st-largest of the 79,663 networks we see originating IPv4, and the 1,037th-largest of 18,476 in the United States. It is seen behind 1 upstream network, most often AS668 (DoD High Performance Computing (Defense…). 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

5

IPv6 prefixes

1

IPv4 addresses

69.1k

IPv6 /64s

65.5k

Upstream graph

The networks AS252 is seen behind, one and two hops out, drawn from real AS paths.

AS252Toward the internet core
Upstream graph for AS252: 3 neighbouring networks observed beyond it across 2 levels. The same networks are listed in the tables below.AS252Headquarters, USA…This networkAS668DoD High Performa…AS2914NTT America, Inc.AS6939Hurricane Electri…

Networks observed one and two hops upstream of AS252 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 AS252
NetworkCountryRelationshipPathsVantage pts
AS668DoD High Performance Computing (Defense Research and Engineering Network)USPeer449141

Prefixes

The largest blocks AS252 originates, widest first.

Largest prefixes originated by AS252
PrefixAddressesVisibility
128.47.0.0/1665.5k77/77
204.37.16.0/212k77/77
131.92.188.0/221k77/77
192.70.236.0/2425677/77
204.37.24.0/2425677/77
2001:480:34::/4865.5k × /6464/64

Routing health

How AS252'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%6

Propagation

  • Globally propagated90% of full-feed peers or more100.0%6
  • Partially propagated40% to 90%0.0%0
  • Seen by few peersUnder 40%0.0%0

Prefix sizes

IPv4 — 5 prefixes

IPv6 — 1 prefixes

  • /4865.5k × /64100.0%1

Recent changes

Announcements that started or stopped since 22nd Sept 2026.

No announcement by AS252 started or stopped in this period.

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