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	Prefix	Description

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Network Policy

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How are upstreams and downstreams calculated?

Upstreams

	ASN	Description	IPv4	IPv6
	AS2734	CoreSite	✔	✘

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Peers

	ASN	Description	IPv4	IPv6
	AS2734	CoreSite	✔	✘
	AS19275	Interval International, Inc.	✔	✘
	AS22330	Catalina Marketing Corporation	✔	✘
	AS62683	PREFIL TEC, INC	✔	✘
	AS55016	Imperium Inc.	✔	✘
	AS393233	Ventiv Technology Inc.	✔	✘
	AS45150	Mphasis Ltd,	✔	✘

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Downstreams

	ASN	Description	IPv4	IPv6
	AS19275	Interval International, Inc.	✔	✘
	AS45150	Mphasis Ltd,	✔	✘
	AS22330	Catalina Marketing Corporation	✔	✘
	AS55016	Imperium Inc.	✔	✘
	AS62683	PREFIL TEC, INC	✔	✘
	AS393233	Ventiv Technology Inc.	✔	✘

ASHandle:       AS396300
OrgID:          COWIL
ASName:         CORESITE-RETIRED
ASNumber:       396300
RegDate:        2017-05-01
Updated:        2022-11-02
Source:         ARIN



OrgID:          COWIL
OrgName:        CoreSite
CanAllocate:    
Street:         1001 17th St
Street:         Suite 500
City:           Denver
State/Prov:     CO
Country:        US
PostalCode:     80202
RegDate:        2005-01-14
Updated:        2025-04-09
OrgAdminHandle: JFA116-ARIN
OrgTechHandle:  CMM8-ARIN
OrgTechHandle:  JENSE37-ARIN
OrgTechHandle:  JFA116-ARIN
OrgTechHandle:  REEDC55-ARIN
OrgTechHandle:  STANL503-ARIN
OrgAbuseHandle: CORES5-ARIN
OrgNOCHandle:   CORES4-ARIN
Source:         ARIN





OrgAdminHandle:       JFA116-ARIN
OrgAdminName:         Jerome Favis
# Email removed, Log into bgp.tools to see whois emails


OrgTechHandle:        CMM8-ARIN
OrgTechName:          Christopher Malayter
# Email removed, Log into bgp.tools to see whois emails


OrgTechHandle:        JENSE37-ARIN
OrgTechName:          John Jensen
# Email removed, Log into bgp.tools to see whois emails


OrgTechHandle:        JFA116-ARIN
OrgTechName:          Jerome Favis
# Email removed, Log into bgp.tools to see whois emails


OrgTechHandle:        REEDC55-ARIN
OrgTechName:          Christopher Reed
# Email removed, Log into bgp.tools to see whois emails


OrgTechHandle:        STANL503-ARIN
OrgTechName:          Michael Stanley
# Email removed, Log into bgp.tools to see whois emails


OrgAbuseHandle:       CORES5-ARIN
OrgAbuseName:          CoreSite Abuse
# Email removed, Log into bgp.tools to see whois emails


OrgNOCHandle:         CORES4-ARIN
OrgNOCName:            Coresite OSC
# Email removed, Log into bgp.tools to see whois emails

Last Update: 2026-05-07T03:38:10Z UTC

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Member of the following AS-SETs

-	Member	ASN Count
RADB	as-coresite-customers	59