AS21589 City of San Jose

CSJ-INTERNET - City of San Jose · registered in the United States

IPv4 addresses10,75218 prefixes · <0.001% of announced IPv4

Rank in United States#2,858largest network in US by IPv4 space, of 18,338 · <0.01% of US

Rank worldwide#8,740of 79,396 networks with IPv4

IPv61 x /481 prefixes

CountryUnited States18,679 ASNs registered there

Open AS21589 in ASN lookup Look up an IP in this network (156.39.0.1) All networks in United States

IPv4 prefixes

All 18 prefixes, in address order.

156.39.0.0/22
156.39.5.0/24
156.39.10.0/23
156.39.12.0/23
156.39.15.0/24
156.39.28.0/24
156.39.48.0/21
156.39.60.0/24
156.39.62.0/23
156.39.64.0/22
156.39.68.0/23
156.39.73.0/24
156.39.99.0/24
156.39.125.0/24
156.39.127.0/24
156.39.131.0/24
156.39.136.0/21
156.39.160.0/24

IPv6 prefixes

All 1 prefix.

2001:470:f0::/48

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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