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	Prefix	Description
	74.123.176.0/24	Microsoft Corporation
	74.123.178.0/24	Microsoft Corporation
	208.92.176.0/23	Microsoft Corporation
	208.92.178.0/23	Microsoft Corporation

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Network Policy

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How are upstreams and downstreams calculated?

Upstreams

	ASN	Description	IPv4	IPv6
	AS209	Lumen (ex. Qwest)	✔	✘
	AS3356	Lumen (Level 3)	✔	✘
	AS13649	Flexential Colorado Corp.	✔	✘

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Peers

	ASN	Description	IPv4	IPv6
	AS209	Lumen (ex. Qwest)	✔	✘
	AS13649	Flexential Colorado Corp.	✔	✘
	AS3356	Lumen (Level 3)	✔	✘

ASHandle:       AS46182
OrgID:          MSFT
ASName:         VAROLII
ASNumber:       46182
RegDate:        2008-06-30
Updated:        2024-10-15
Source:         ARIN



OrgID:          MSFT
OrgName:        Microsoft Corporation
CanAllocate:    
Street:         One Microsoft Way
City:           Redmond
State/Prov:     WA
Country:        US
PostalCode:     98052
Comment:        To report suspected security issues specific to traffic emanating from Microsoft online services, including the distribution of malicious content or other illicit or illegal material through a Microsoft online service, please submit reports to:
Comment:        * https://cert.microsoft.com.  
Comment:        For SPAM and other abuse issues, such as Microsoft Accounts, please contact:
Comment:        * abuse@microsoft.com.  
Comment:        To report security vulnerabilities in Microsoft products and services, please contact:
Comment:        * secure@microsoft.com.  
Comment:        For legal and law enforcement-related requests, please contact:
Comment:        * msndcc@microsoft.com
Comment:        For routing, peering or DNS issues, please 
Comment:        contact:
Comment:        * IOC@microsoft.com
RegDate:        1998-07-10
Updated:        2025-06-10
OrgAdminHandle: IPHOS5-ARIN
OrgTechHandle:  BEDAR6-ARIN
OrgTechHandle:  IPHOS5-ARIN
OrgTechHandle:  MRPD-ARIN
OrgTechHandle:  SINGH683-ARIN
OrgAbuseHandle: MAC74-ARIN
OrgRoutingHandle:   CHATU3-ARIN
Source:         ARIN





OrgAdminHandle:       IPHOS5-ARIN
OrgAdminName:         IPHostmaster IPHostmaster
# Email removed, Log into bgp.tools to see whois emails


OrgTechHandle:        BEDAR6-ARIN
OrgTechName:          Dawn Bedard
# Email removed, Log into bgp.tools to see whois emails


OrgTechHandle:        IPHOS5-ARIN
OrgTechName:          IPHostmaster IPHostmaster
# Email removed, Log into bgp.tools to see whois emails


OrgTechHandle:        MRPD-ARIN
OrgTechName:           Microsoft Routing, Peering, and DNS
# Email removed, Log into bgp.tools to see whois emails


OrgTechHandle:        SINGH683-ARIN
OrgTechName:          Prachi Singh
# Email removed, Log into bgp.tools to see whois emails


OrgAbuseHandle:       MAC74-ARIN
OrgAbuseName:          Microsoft Abuse Contact
# Email removed, Log into bgp.tools to see whois emails


OrgRoutingHandle:     CHATU3-ARIN
OrgRoutingName:       Somesh Chaturmohta
# Email removed, Log into bgp.tools to see whois emails

Last Update: 2026-06-14T03:26:34Z UTC

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Member of the following AS-SETs

-	Member	ASN Count
LEVEL3	as-lumen-customers-asns	10695
RADB	as-viawest-transit	320
LEVEL3	as-as209-cust	1818
RADB	as-flexential-test2	278
RADB	as-flexential-customers	351