subnet.im

AS40271San Francisco Metropolitan Internet Exchange (SFMIX)

United StatesRegistryARIN

As of 23rd October 2026, AS40271 (San Francisco Metropolitan Internet…), a network registered in the United States with ARIN, originates 2 IPv4 prefixes covering 768 addresses and 1 IPv6 prefix. By IPv4 address space that makes it the 44,967th-largest of the 79,659 networks we see originating IPv4, and the 9,401st-largest of 18,482 in the United States. It is seen behind 4 upstream networks, most often AS6939 (Hurricane Electric LLC) and AS58511 (Swoop (Anycast Global Backbone)), and in front of 3 downstream networks. Every one of its announcements has a valid RPKI ROA, and none are RPKI-invalid. 100% of its routes reach at least 90% of full-feed peers.

At a glance

IPv4 prefixes

2

IPv6 prefixes

1

IPv4 addresses

768

IPv6 /64s

65.5k

Upstream graph

The networks AS40271 is seen behind, one and two hops out, drawn from real AS paths.

AS40271Toward the internet core
Upstream graph for AS40271: 11 neighbouring networks observed beyond it across 2 levels. The same networks are listed in the tables below.AS40271San Francisco Met…This networkAS6939Hurricane Electri…AS35280F5 Networks SARLAS49544i3D.net B.VAS58511Swoop (Anycast Gl…AS18106Viewqwest Pte LtdAS20130Depaul UniversityAS32590Valve CorporationAS1299Arelion (fka. Tel…AS2914NTT America, Inc.AS3356Lumen (Level 3)AS3491PCCW Global (HK) …

Networks observed one and two hops upstream of AS40271 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

109

adjacent networks

Upstreams
44%
Peers
10294%
Downstreams
33%

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

Upstreams of AS40271
NetworkCountryRelationshipPathsVantage pts
AS6939Hurricane Electric LLCUSPeer209135
AS58511Swoop (Anycast Global Backbone)AUPeer292
AS35280F5 Networks SARLFRPeer111
AS49544i3D.net B.VNLPeer32

Prefixes

The largest blocks AS40271 originates, widest first.

Largest prefixes originated by AS40271
PrefixAddressesVisibility
149.112.188.0/2351277/77
149.112.115.0/2425677/77
2620:11a:b002::/4865.5k × /6463/64

Routing health

How AS40271'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

  • Valid100.0%3
  • Invalid0.0%0
  • No ROA0.0%0

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 — 2 prefixes

IPv6 — 1 prefixes

  • /4865.5k × /64100.0%1

Recent changes

Announcements that started or stopped since 23rd Sept 2026.

No announcement by AS40271 started or stopped in this period.

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