AS12276 San Francisco Metropolitan Internet Exchange (SFMIX)

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

IPv4 addresses2561 prefixes · <0.001% of announced IPv4

Rank in United States#13,174largest network in US by IPv4 space, of 18,338 · <0.01% of US

Rank worldwide#60,679of 79,396 networks with IPv4

IPv615 x /484 prefixes

CountryUnited States18,679 ASNs registered there

Open AS12276 in ASN lookup Look up an IP in this network (192.33.255.1) All networks in United States

IPv4 prefixes

All 1 prefix, in address order.

192.33.255.0/24

IPv6 prefixes

All 4 prefixes.

2620:11a:b000::/47
2620:11a:b003::/48
2620:11a:b004::/46
2620:11a:b008::/45

Other ASNs named San Francisco Metropolitan Internet Exchange (SFMIX)

1 other network uses the same organisation name; together with AS12276 they announce 1,024 IPv4 addresses.

ASNNameIPv4 addresses

AS40271SFMIX-TRANSIT - San Francisco Metropolitan Internet Exchange (SFMIX) US768

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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