AS40271 San Francisco Metropolitan Internet Exchange (SFMIX)

SFMIX-TRANSIT - San Francisco Metropolitan Internet Exchange (SFMIX) · registered in the United States

IPv4 addresses7682 prefixes · <0.001% of announced IPv4

Rank in United States#9,230largest network in US by IPv4 space, of 18,338 · <0.01% of US

Rank worldwide#43,424of 79,396 networks with IPv4

IPv61 x /481 prefixes

CountryUnited States18,679 ASNs registered there

Open AS40271 in ASN lookup Look up an IP in this network (149.112.115.1) All networks in United States

IPv4 prefixes

All 2 prefixes, in address order.

149.112.115.0/24
149.112.188.0/23

IPv6 prefixes

All 1 prefix.

2620:11a:b002::/48

Other ASNs named San Francisco Metropolitan Internet Exchange (SFMIX)

1 other network uses the same organisation name; together with AS40271 they announce 1,024 IPv4 addresses.

ASNNameIPv4 addresses

AS12276SFMIX-MGMT - San Francisco Metropolitan Internet Exchange (SFMIX) US256

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IP-to-ASN data: iptoasn.com (public domain). Snapshot downloaded 2026-11-11, refreshed daily. Ranges are what each network announces in BGP, not registry allocations. Data sources