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Data as of Nov 7, 2026

51.4.0.0/16

No anonymizer space · no proxy exits in 30 days

Microsoft Corporation · space held by Microsoft Deutschland MCIO GmbH

Announcement
51.4.0.0/15
RPKI valid
Announced by
AS8075
Type
Hosting
Risk
50 / 100 · Medium

Registrations in this block

The registry's network records over this block, widest first, each under its parent.

RangeAddressesNetnameHolderTypeCreatedAbuse contact
51.4.0.0/15131,072MICROSOFTMicrosoft Deutschland MCIO GmbH (ORG-MDMG3-RIPE) · DELEGACYMay 21, 2015abuse@microsoft.com
└ 51.4.0.0/1665,536cloudunknownLEGACYAug 28, 2025abuse@microsoft.com
via MICROSOFT

A contact marked “via” is the registry's: the record names none of its own, so the registry hands down its parent's.

Network & registry

AnnouncementRouting historyRPKI & IRRWhois & abuse
Announced by

Covering announcement 51.4.0.0/15

Prefix
51.4.0.0/15
Announced by
AS8075 Microsoft Corporation
Type
Hosting
RPKI
RPKI valid
Netname
MICROSOFT
Registrant
Microsoft Deutschland MCIO GmbH
RIR
RIPE NCC
Origin network

AS8075

US
Name
Microsoft Corporation
Type
Hosting
Registered
Mar 31, 1997
Domain
microsoft.com
Website
www.microsoft.com
Industry
Software Development
Spamhaus ASN-DROP
not listed