ASN AS11160 is an Autonomous System Number used to identify a network for BGP internet routing.

Who manages ASN AS11160?

AS11160 is listed under COSTAR GROUP Inc..

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.

AS11160 COSTAR GROUP Inc. | IPGeolocation.io

ASN Lookup Tool

COSTAR GROUP Inc. costar.com

US 3 Routes

AS Data

AS11160

AS11160 – COSTAR GROUP Inc.

AS Number	11160
AS Name	COSTAR-SANDIEGO
Organization	COSTAR GROUP Inc.(costar-2)
Country	US
Website	costar.com
Number of IPv4 Routes	3
Number of IPv6 Routes	0
ASN type	BUSINESS
Registry	ARIN
Date Allocated	1998-05-01

ASN Intelligence API for production workflows

Use ASN data for AS11160 in automation: routing intelligence, peering analysis, ownership checks, and network observability.

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IP Ranges

Route	Origin	Origin Name	ISP	# IPs
204.253.48.0/24	AS11160	COSTAR GROUP Inc.	COSTAR REALTY	256
38.64.74.0/24	AS11160	COSTAR GROUP Inc.	COSTAR GROUP INC	256
65.200.12.0/24	AS11160	COSTAR GROUP Inc.	COSTAR GROUP, INC	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:       11160
ASName:         COSTAR-SANDIEGO
ASHandle:       AS11160
RegDate:        1998-05-01
Updated:        2024-08-01    
Ref:            https://rdap.arin.net/registry/autnum/11160


OrgName:        COSTAR GROUP Inc.
OrgId:          COSTAR-2
Address:        1331 L St N.W.
City:           Washington
StateProv:      DC
PostalCode:     20005-4293
Country:        US
RegDate:        2000-01-06
Updated:        2024-08-12
Ref:            https://rdap.arin.net/registry/entity/COSTAR-2


OrgAbuseHandle: STONG5-ARIN
OrgAbuseName:   Stong, Ian 
OrgAbusePhone:  +1-202-336-6960 
OrgAbuseEmail:  istong@costar.com
OrgAbuseRef:    https://rdap.arin.net/registry/entity/STONG5-ARIN

OrgTechHandle: CNT13-ARIN
OrgTechName:   Costar Network Team
OrgTechPhone:  +1-202-336-6960 
OrgTechEmail:  costarnetworkteam@costar.com
OrgTechRef:    https://rdap.arin.net/registry/entity/CNT13-ARIN

OrgAbuseHandle: CNT13-ARIN
OrgAbuseName:   Costar Network Team
OrgAbusePhone:  +1-202-336-6960 
OrgAbuseEmail:  costarnetworkteam@costar.com
OrgAbuseRef:    https://rdap.arin.net/registry/entity/CNT13-ARIN

OrgRoutingHandle: CNT13-ARIN
OrgRoutingName:   Costar Network Team
OrgRoutingPhone:  +1-202-336-6960 
OrgRoutingEmail:  costarnetworkteam@costar.com
OrgRoutingRef:    https://rdap.arin.net/registry/entity/CNT13-ARIN

OrgDNSHandle: CNT13-ARIN
OrgDNSName:   Costar Network Team
OrgDNSPhone:  +1-202-336-6960 
OrgDNSEmail:  costarnetworkteam@costar.com
OrgDNSRef:    https://rdap.arin.net/registry/entity/CNT13-ARIN

OrgNOCHandle: CNT13-ARIN
OrgNOCName:   Costar Network Team
OrgNOCPhone:  +1-202-336-6960 
OrgNOCEmail:  costarnetworkteam@costar.com
OrgNOCRef:    https://rdap.arin.net/registry/entity/CNT13-ARIN

OrgTechHandle: STONG5-ARIN
OrgTechName:   Stong, Ian 
OrgTechPhone:  +1-202-336-6960 
OrgTechEmail:  istong@costar.com
OrgTechRef:    https://rdap.arin.net/registry/entity/STONG5-ARIN

RTechHandle: MSM74-ARIN
RTechName:   Mascorro, Mathew Santos
RTechPhone:  +1-858-678-4167 
RTechEmail:  mmascorro@costar.com
RTechRef:    https://rdap.arin.net/registry/entity/MSM74-ARIN

RTechHandle: GPG-ARIN
RTechName:   Guidi, Gino Pietro
RTechPhone:  +1-858-678-4155 
RTechEmail:  gguidi@costar.com
RTechRef:    https://rdap.arin.net/registry/entity/GPG-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
AS3549	Level 3 Communications, Inc. (GBLX)	US
AS3549	Level 3 Parent, LLC	US
AS1239	Cogent Communications, LLC	US
AS701	Verizon Business/UUnet	US
AS3356	Level 3 Parent, LLC	US
AS174	Cogent Communications, LLC	US
AS701	Verizon Business	US

Upstreams

AS Number	Description	Country
AS3549	Level 3 Parent, LLC	US
AS3356	Level 3 Parent, LLC	US
AS174	Cogent Communications, LLC	US
AS701	Verizon Business	US