AS21525 Seattle Public Library

AS-SPL - Seattle Public Library · registered in the United States

IPv4 addresses4,0961 prefixes · <0.001% of announced IPv4

Rank in United States#4,575largest network in US by IPv4 space, of 18,338 · <0.01% of US

Rank worldwide#15,519of 79,396 networks with IPv4

IPv61 x /481 prefixes

CountryUnited States18,679 ASNs registered there

Open AS21525 in ASN lookup Look up an IP in this network (66.212.64.1) All networks in United States

IPv4 prefixes

All 1 prefix, in address order.

66.212.64.0/20

IPv6 prefixes

All 1 prefix.

2620:18::/48

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AS25979#4577 COMDC-WI - CITY OF MADISON4,096

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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