AS399433 Blue Cross Blue Shield of Illinois or Blue Cross Blue Shield of Texas

AS-MS-78058 - Blue Cross Blue Shield of Illinois or Blue Cross Blue Shield of Texas · registered in the United States

IPv4 addresses2561 prefixes · <0.001% of announced IPv4

Rank in United States#17,688largest network in US by IPv4 space, of 18,338 · <0.01% of US

Rank worldwide#78,622of 79,396 networks with IPv4

IPv6noneno IPv6 routes announced

CountryUnited States18,679 ASNs registered there

Open AS399433 in ASN lookup Look up an IP in this network (8.17.21.1) All networks in United States

IPv4 prefixes

All 1 prefix, in address order.

8.17.21.0/24

Other ASNs named Blue Cross Blue Shield of Illinois or Blue Cross Blue Shield of Texas

5 other networks use the same organisation name; together with AS399433 they announce 2,304 IPv4 addresses.

ASNNameIPv4 addresses

AS23494HSC - Blue Cross Blue Shield of Illinois or Blue Cross Blue Shield of Texas US1,024

AS21608HCSCNET10 - Blue Cross Blue Shield of Illinois or Blue Cross Blue Shield of Texas US256

AS399432AS-MS-78058 - Blue Cross Blue Shield of Illinois or Blue Cross Blue Shield of Texas US256

AS399721AS-MS-78065 - Blue Cross Blue Shield of Illinois or Blue Cross Blue Shield of Texas US256

AS399722AS-MS-78065 - Blue Cross Blue Shield of Illinois or Blue Cross Blue Shield of Texas US256

Similar-sized networks in United States

ASNNameIPv4 addresses

AS399422#17685 UNIVERSAL-HOLDINGS - Universal Insurance Holdings, Inc.256

AS399424#17686 RELEASEPOINT1 - Releasepoint256

AS399432#17687 AS-MS-78058 - Blue Cross Blue Shield of Illinois or Blue Cross Blue Shield of Texas256

AS399434#17689 SFCC-EDU - Santa Fe Community College256

AS399436#17690 CORTLAND-COUNTY - Cortland County Health Department256

AS399437#17691 LUZERNE-IT-ASN - Luzerne County256

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