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AS1909San Diego Supercomputer Center

United StatesRegistryARIN

As of 26th September 2026, AS1909 (San Diego Supercomputer Center), a network registered in the United States with ARIN, originates 1 IPv4 prefix covering 256 addresses and 2 IPv6 prefixes. By IPv4 address space that makes it the 59,122nd-largest of the 79,516 networks we see originating IPv4, and the 12,871st-largest of 18,424 in the United States. It is seen behind 1 upstream network, most often AS195 (San Diego Supercomputer Center). 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

1

IPv6 prefixes

2

IPv4 addresses

256

IPv6 /64s

134M

Upstream graph

The networks AS1909 is seen behind, one and two hops out, drawn from real AS paths.

AS1909Toward the internet core
Upstream graph for AS1909: 3 neighbouring networks observed beyond it across 2 levels. The same networks are listed in the tables below.AS1909San Diego Superco…This networkAS195San Diego Superco…AS2152CENIC - CalRENAS22773Cox Communication…

Networks observed one and two hops upstream of AS1909 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 AS1909
NetworkCountryRelationshipPathsVantage pts
AS195San Diego Supercomputer CenterUSPeer207144

Prefixes

The largest blocks AS1909 originates, widest first.

Largest prefixes originated by AS1909
PrefixAddressesVisibility
192.172.226.0/2425681/81
2001:48d0:5000::/37134M × /6463/64
2001:48d0:5000::/4865.5k × /6463/64

Routing health

How AS1909'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%3

Propagation

  • Globally propagated90% of full-feed peers or more100.0%3
  • Partially propagated40% to 90%0.0%0
  • Seen by few peersUnder 40%0.0%0

Prefix sizes

IPv4 — 1 prefixes

IPv6 — 2 prefixes

  • /37134M × /6450.0%1
  • /4865.5k × /6450.0%1

Recent changes

Announcements that started or stopped since 28th Aug 2026.

No announcement by AS1909 started or stopped in this period.

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