AS21608 Blue Cross Blue Shield of Illinois or Blue Cross Blue Shield of Texas

HCSCNET10 - 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#14,421largest network in US by IPv4 space, of 18,338 · <0.01% of US

Rank worldwide#64,223of 79,396 networks with IPv4

IPv6noneno IPv6 routes announced

CountryUnited States18,679 ASNs registered there

Open AS21608 in ASN lookup Look up an IP in this network (208.79.27.1) All networks in United States

IPv4 prefixes

All 1 prefix, in address order.

208.79.27.0/24

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 AS21608 they announce 2,304 IPv4 addresses.

ASNNameIPv4 addresses

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

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

AS399433AS-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

AS21602#14418 CFVHS - Cape Fear Valley Medical Center256

AS21605#14419 AHBELO-CORP - DallasNews Corporation256

AS21607#14420 LAZERWARE-INC - LAZERWARE INC256

AS21610#14422 SAP-SE-YVR - SAP America Inc.256

AS21611#14423 NET-WSGWIN - Wilson Sporting Goods Co.256

AS21619#14424 GREYWOLF-CAPITAL - Greywolf Capital Management LP256

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