AS63138 Blue Shield of California

SAC-COLO1 - Blue Shield of California · registered in the United States

IPv4 addresses1,2803 prefixes · <0.001% of announced IPv4

Rank in United States#7,656largest network in US by IPv4 space, of 18,338 · <0.01% of US

Rank worldwide#29,083of 79,396 networks with IPv4

IPv6noneno IPv6 routes announced

CountryUnited States18,679 ASNs registered there

Open AS63138 in ASN lookup Look up an IP in this network (165.253.34.1) All networks in United States

IPv4 prefixes

All 3 prefixes, in address order.

165.253.34.0/23
165.253.42.0/24
165.253.134.0/23

Other ASNs named Blue Shield of California

1 other network uses the same organisation name; together with AS63138 they announce 2,304 IPv4 addresses.

ASNNameIPv4 addresses

AS63174LAS-COLO2 - Blue Shield of California US1,024

Similar-sized networks in United States

ASNNameIPv4 addresses

AS62795#7653 CITRIXSYSTEMS-AS-US - Citrix1,280

AS62839#7654 FADV - First Advantage Corporation1,280

AS63031#7655 WEBBYENT - Webby Enterprises LLC1,280

AS63168#7657 TRP-COLORADO-SPRINGS - T. Rowe Price Associates, INC.1,280

AS63217#7658 VISTEX - Vistex Inc.1,280

AS63299#7659 PATHWAYS - Pathways Health and Community Support LLC1,280

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