ASN AS21608 is an Autonomous System Number used to identify a network for BGP internet routing.

Who manages ASN AS21608?

AS21608 is listed under Blue Cross Blue Shield of Illinois or Blue Cross Blue Shield of Texas.

What do peers, upstreams, and downstreams mean in ASN data?

Peers are lateral network interconnections, upstreams are transit providers, and downstreams are customer networks receiving connectivity.

What are routes and IP ranges for an ASN?

Routes and IP ranges are the network prefixes announced by the ASN on the internet and show the address space it originates.

Why is WHOIS data shown for an ASN?

WHOIS data provides registration and contact context for ASN ownership, administration, and operational reference.

How can I access the full ASN tables?

The page shows a preview of large ASN datasets. Use the page controls to load more rows, and upgrade to a paid plan for complete access.

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

ASN Lookup Tool

Blue Cross Blue Shield of Illinois or Blue Cross Blue Shield of Texas bcbstx.com

US 1 Routes

AS Data

AS21608

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

AS Number	21608
AS Name	HCSCNET10
Organization	Blue Cross Blue Shield of Illinois or Blue Cross Blue Shield of Texas(hscbcbi)
Country	US
Website	bcbstx.com
Number of IPv4 Routes	1
Number of IPv6 Routes	0
ASN type	BUSINESS
Registry	ARIN
Date Allocated	2007-04-23

ASN Intelligence API for production workflows

Use ASN data for AS21608 in automation: routing intelligence, peering analysis, ownership checks, and network observability.

Access complete peers, upstreams, downstreams, routes, WHOIS, and contact intelligence via our API. Learn more

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IP Ranges

Route	Origin	Origin Name	ISP	# IPs
208.79.27.0/24	AS21608	Blue Cross Blue Shield of Illinois or Blue Cross Blue Shield of Texas	Blue Cross Blue Shield of Illinois or Blue Cross Blue Shield of Texas	256

Raw Whois Response

#
# ARIN WHOIS data and services are subject to the Terms of Use
# available at: https://www.arin.net/resources/registry/whois/tou/
#
# If you see inaccuracies in the results, please report at
# https://www.arin.net/resources/registry/whois/inaccuracy_reporting/
#
# Copyright 1997-2026, American Registry for Internet Numbers, Ltd.
#


ASNumber:       21608
ASName:         HCSCNET10
ASHandle:       AS21608
RegDate:        2007-04-23
Updated:        2012-02-24    
Ref:            https://rdap.arin.net/registry/autnum/21608


OrgName:        Blue Cross Blue Shield of Illinois or Blue Cross Blue Shield of Texas
OrgId:          HSCBCBI
Address:        300 E. Randolph Street
City:           Chicago
StateProv:      IL
PostalCode:     60601
Country:        US
RegDate:        2002-03-27
Updated:        2024-05-17
Ref:            https://rdap.arin.net/registry/entity/HSCBCBI


OrgTechHandle: MSA111-ARIN
OrgTechName:   Sanner, Michael 
OrgTechPhone:  +1-972-766-3576 
OrgTechEmail:  michael_sanner@hcsc.net
OrgTechRef:    https://rdap.arin.net/registry/entity/MSA111-ARIN

OrgTechHandle: BARRK5-ARIN
OrgTechName:   Barr, Kevin 
OrgTechPhone:  +1-214-862-5353 
OrgTechEmail:  kevin_barr@bcbstx.com
OrgTechRef:    https://rdap.arin.net/registry/entity/BARRK5-ARIN

OrgAbuseHandle: MSA111-ARIN
OrgAbuseName:   Sanner, Michael 
OrgAbusePhone:  +1-972-766-3576 
OrgAbuseEmail:  michael_sanner@hcsc.net
OrgAbuseRef:    https://rdap.arin.net/registry/entity/MSA111-ARIN

RAbuseHandle: MSA111-ARIN
RAbuseName:   Sanner, Michael 
RAbusePhone:  +1-972-766-3576 
RAbuseEmail:  michael_sanner@hcsc.net
RAbuseRef:    https://rdap.arin.net/registry/entity/MSA111-ARIN

RTechHandle: MSA111-ARIN
RTechName:   Sanner, Michael 
RTechPhone:  +1-972-766-3576 
RTechEmail:  michael_sanner@hcsc.net
RTechRef:    https://rdap.arin.net/registry/entity/MSA111-ARIN


#
# ARIN WHOIS data and services are subject to the Terms of Use
# available at: https://www.arin.net/resources/registry/whois/tou/
#
# If you see inaccuracies in the results, please report at
# https://www.arin.net/resources/registry/whois/inaccuracy_reporting/
#
# Copyright 1997-2026, American Registry for Internet Numbers, Ltd.
#

Parsed Whois Response

Peers

AS Number	Description	Country
AS7018	AT&T Enterprises, LLC	US
AS3549	Level 3 Communications, Inc. (GBLX)	US
AS3356	Level 3 Parent, LLC	US

Upstreams

AS Number	Description	Country
AS7018	AT&T Enterprises, LLC	US
AS3356	Level 3 Parent, LLC	US