subnet.im

AS264SRI International

United StatesRegistryARIN

As of 23rd October 2026, AS264 (SRI International), a network registered in the United States with ARIN, originates 36 IPv4 prefixes covering 74.8k addresses. By IPv4 address space that makes it the 2,915th-largest of the 79,659 networks we see originating IPv4, and the 935th-largest of 18,482 in the United States. It is seen behind 2 upstream networks, most often AS6461 (Zayo Bandwidth) and AS174 (Cogent Communications, LLC). 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

36

IPv6 prefixes

0

IPv4 addresses

74.8k

IPv6 /64s

0

Upstream graph

The networks AS264 is seen behind, one and two hops out, drawn from real AS paths.

AS264Toward the internet core
Upstream graph for AS264: 6 neighbouring networks observed beyond it across 2 levels. The same networks are listed in the tables below.AS264SRI InternationalThis networkAS174Cogent Communicat…AS6461Zayo BandwidthAS1299Arelion (fka. Tel…AS151326DCConnect Communi…AS2914NTT America, Inc.AS32590Valve Corporation

Networks observed one and two hops upstream of AS264 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

5

adjacent networks

Upstreams
240%
Peers
360%
Downstreams
00%

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

Upstreams of AS264
NetworkCountryRelationshipPathsVantage pts
AS6461Zayo BandwidthUSPeer2,00277
AS174Cogent Communications, LLCUSPeer76076

Prefixes

All 36

The largest blocks AS264 originates, widest first.

Largest prefixes originated by AS264
PrefixAddressesVisibility
128.18.0.0/1665.5k77/77
128.57.128.0/2351277/77
128.57.47.0/2425676/77
128.57.50.0/2425676/77
128.57.60.0/2425676/77
128.57.61.0/2425676/77
128.57.62.0/2425676/77
128.57.89.0/2425676/77
128.57.92.0/2425676/77
128.57.93.0/2425676/77

Routing health

How AS264'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%36

Propagation

  • Globally propagated90% of full-feed peers or more100.0%36
  • Partially propagated40% to 90%0.0%0
  • Seen by few peersUnder 40%0.0%0

Prefix sizes

IPv4 — 36 prefixes

Recent changes

Announcements that started or stopped since 23rd Sept 2026.

  • Withdrawn128.57.90.0/2412th Oct 2026

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