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	Prefix	Description
	38.64.74.0/24	COSTAR GROUP INC
	65.200.12.0/24	COSTAR GROUP, INC
	204.253.48.0/24	COSTAR REALTY

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Network Policy

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How are upstreams and downstreams calculated?

Upstreams

	ASN	Description	IPv4	IPv6
	AS701	Verizon Business	✔	✘
	AS174	Cogent Communications, LLC	✔	✘
	AS3549	Lumen (fka. Global Crossing)	✔	✘
	AS3356	Lumen (Level 3)	✔	✘

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Peers

	ASN	Description	IPv4	IPv6
	AS701	Verizon Business	✔	✘
	AS174	Cogent Communications, LLC	✔	✘
	AS3549	Lumen (fka. Global Crossing)	✔	✘
	AS3356	Lumen (Level 3)	✔	✘
	AS1239	Sprint Wireline (Cogent)	✔	✘

ASHandle:       AS11160
OrgID:          COSTAR-2
ASName:         COSTAR-SANDIEGO
ASNumber:       11160
RegDate:        1998-05-01
Updated:        2024-08-01
TechHandle:     GPG-ARIN
TechHandle:     MSM74-ARIN
Source:         ARIN



OrgID:          COSTAR-2
OrgName:        COSTAR GROUP Inc.
CanAllocate:    
Street:         1331 L St N.W.
City:           Washington
State/Prov:     DC
Country:        US
PostalCode:     20005-4293
RegDate:        2000-01-06
Updated:        2024-08-12
OrgAdminHandle: STONG5-ARIN
OrgTechHandle:  CNT13-ARIN
OrgTechHandle:  STONG5-ARIN
OrgAbuseHandle: CNT13-ARIN
OrgAbuseHandle: STONG5-ARIN
OrgNOCHandle:   CNT13-ARIN
OrgRoutingHandle:   CNT13-ARIN
OrgDNSHandle:   CNT13-ARIN
Source:         ARIN





OrgAdminHandle:       STONG5-ARIN
OrgAdminName:         Ian Stong
# Email removed, Log into bgp.tools to see whois emails


OrgTechHandle:        CNT13-ARIN
OrgTechName:           Costar Network Team
# Email removed, Log into bgp.tools to see whois emails


OrgTechHandle:        STONG5-ARIN
OrgTechName:          Ian Stong
# Email removed, Log into bgp.tools to see whois emails


OrgAbuseHandle:       CNT13-ARIN
OrgAbuseName:          Costar Network Team
# Email removed, Log into bgp.tools to see whois emails


OrgAbuseHandle:       STONG5-ARIN
OrgAbuseName:         Ian Stong
# Email removed, Log into bgp.tools to see whois emails


OrgNOCHandle:         CNT13-ARIN
OrgNOCName:            Costar Network Team
# Email removed, Log into bgp.tools to see whois emails


OrgRoutingHandle:     CNT13-ARIN
OrgRoutingName:        Costar Network Team
# Email removed, Log into bgp.tools to see whois emails


OrgDNSHandle:         CNT13-ARIN
OrgDNSName:            Costar Network Team
# Email removed, Log into bgp.tools to see whois emails


TechHandle:           GPG-ARIN
TechName:             Gino Guidi
# Email removed, Log into bgp.tools to see whois emails


TechHandle:           MSM74-ARIN
TechName:             Mathew Mascorro
# Email removed, Log into bgp.tools to see whois emails

Last Update: 2025-12-24T03:27:48Z UTC

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Member of the following AS-SETs

-	Member	ASN Count
LEVEL3	as-lumen-customers-asns	10695