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AS394547San Francisco Bay Area Rapid Transit District

United StatesRegistryARIN

As of 24th October 2026, AS394547 (San Francisco Bay Area Rapid Transit…), a network registered in the United States with ARIN, originates 12 IPv4 prefixes covering 19.2k addresses. By IPv4 address space that makes it the 7,268th-largest of the 79,642 networks we see originating IPv4, and the 2,363rd-largest of 18,487 in the United States. It is seen behind 2 upstream networks, most often AS3356 (Lumen (Level 3)) and AS7018 (AT&T Enterprises, 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

12

IPv6 prefixes

0

IPv4 addresses

19.2k

IPv6 /64s

0

Upstream graph

The networks AS394547 is seen behind, one and two hops out, drawn from real AS paths.

AS394547Toward the internet core
Upstream graph for AS394547: 5 neighbouring networks observed beyond it across 2 levels. The same networks are listed in the tables below.AS394547San Francisco Bay…This networkAS3356Lumen (Level 3)AS7018AT&T Enterprises,…AS2914NTT America, Inc.AS3549Lumen (fka. Globa…AS1299Arelion (fka. Tel…

Networks observed one and two hops upstream of AS394547 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

3

adjacent networks

Upstreams
267%
Peers
133%
Downstreams
00%

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

Upstreams of AS394547
NetworkCountryRelationshipPathsVantage pts
AS3356Lumen (Level 3)USPeer89675
AS7018AT&T Enterprises, LLCUSAdjacent165

Prefixes

The largest blocks AS394547 originates, widest first.

Largest prefixes originated by AS394547
PrefixAddressesVisibility
148.165.64.0/1816.4k76/76
148.165.65.0/2425676/76
148.165.81.0/2425676/76
148.165.94.0/2425676/76
148.165.95.0/2425676/76
148.165.98.0/2425676/76
148.165.99.0/2425676/76
148.165.100.0/2425676/76
148.165.108.0/2425676/76
148.165.120.0/2425676/76

Routing health

How AS394547'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%12

Propagation

  • Globally propagated90% of full-feed peers or more100.0%12
  • Partially propagated40% to 90%0.0%0
  • Seen by few peersUnder 40%0.0%0

Prefix sizes

IPv4 — 12 prefixes

Recent changes

Announcements that started or stopped since 24th Sept 2026.

No announcement by AS394547 started or stopped in this period.

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