Microsoft

Microsoft Corporation
GLEIF verified
LEI
967600DJA1Q8K13MZ845
Registered name
Microsoft
Jurisdiction
BE
Ultimate parent
No parent on file in GLEIF
Cluster stats
Netblocks63,585 · 219,104,091 IPv4 addresses
Registered in United States (2,204) · United Kingdom (677) · South Africa (47) · Brazil (36) · Singapore (21) · Germany (5)
All fragments 63,717 blocks across 48 clusters
Cluster ID213232603
RegistryAFRINIC
Owner jurisdictionBE
Customersfind customers using this network →
Evidence & provenance ?
Attribution GLEIF legal-entity match
Legal identityLEI 967600DJA1Q8K13MZ845
Shared handles clustered on 100 shared RIR contact/maintainer handles
Registry names 24 distinct registrant names across these blocks
full provenance (JSON) → · how attribution works

Footprint over time

6 weekly snapshots · JSON
63,585 +524 netblocks since 2026-07-05
2026-07-05 peak 63,585 2026-07-26

IP Ranges (63,585)

showing 50 of 63,585 — see all — ⬇ export CSV (free export limited to 500 rows — subscribe for the full export)
CIDR Org name Registry Status Confidence
1.7.247.31/32 Microsoft PEERINGDB ASSIGNED ● high
1.7.247.188/32 Microsoft PEERINGDB ASSIGNED ● high
1.186.0.0/16 Microsoft Corporation BGP ANNOUNCED ● high
2.58.103.0/24 Microsoft Corporation BGP ANNOUNCED ● high
4.144.0.0/12 Microsoft Corporation BGP ANNOUNCED ● high
4.144.0.0/17 Microsoft Corporation MICROSOFT ANNOUNCED ● high
4.144.9.0/26 Microsoft Corporation MICROSOFT ANNOUNCED ● high
4.144.9.64/27 Microsoft Corporation MICROSOFT ANNOUNCED ● high
4.144.10.32/27 Microsoft Corporation MICROSOFT ANNOUNCED ● high
4.144.10.64/26 Microsoft Corporation MICROSOFT ANNOUNCED ● high
4.144.15.72/29 Microsoft Corporation MICROSOFT ANNOUNCED ● high
4.144.32.35/32 Microsoft Corporation MICROSOFT ANNOUNCED ● high
4.144.51.0/24 Microsoft Corporation MICROSOFT ANNOUNCED ● high
4.144.52.0/25 Microsoft Corporation MICROSOFT ANNOUNCED ● high
4.144.55.88/30 Microsoft Corporation MICROSOFT ANNOUNCED ● high
4.144.128.0/17 Microsoft Corporation MICROSOFT ANNOUNCED ● high
4.144.200.166/32 Microsoft Corporation MICROSOFT ANNOUNCED ● high
4.144.201.132/32 Microsoft Corporation MICROSOFT ANNOUNCED ● high
4.144.203.72/31 Microsoft Corporation MICROSOFT ANNOUNCED ● high
4.144.203.73/32 Microsoft Corporation MICROSOFT ANNOUNCED ● high
4.144.203.116/32 Microsoft Corporation MICROSOFT ANNOUNCED ● high
4.144.203.254/31 Microsoft Corporation MICROSOFT ANNOUNCED ● high
4.144.203.255/32 Microsoft Corporation MICROSOFT ANNOUNCED ● high
4.144.204.223/32 Microsoft Corporation MICROSOFT ANNOUNCED ● high
4.145.0.0/16 Microsoft Corporation MICROSOFT ANNOUNCED ● high
4.145.0.64/29 Microsoft Corporation MICROSOFT ANNOUNCED ● high
4.145.0.80/28 Microsoft Corporation MICROSOFT ANNOUNCED ● high
4.145.0.106/31 Microsoft Corporation MICROSOFT ANNOUNCED ● high
4.145.0.192/27 Microsoft Corporation MICROSOFT ANNOUNCED ● high
4.145.8.112/28 Microsoft Corporation MICROSOFT ANNOUNCED ● high
4.145.10.168/29 Microsoft Corporation MICROSOFT ANNOUNCED ● high
4.145.12.240/28 Microsoft Corporation MICROSOFT ANNOUNCED ● high
4.145.16.28/30 Microsoft Corporation MICROSOFT ANNOUNCED ● high
4.145.16.48/28 Microsoft Corporation MICROSOFT ANNOUNCED ● high
4.145.16.144/29 Microsoft Corporation MICROSOFT ANNOUNCED ● high
4.145.16.160/28 Microsoft Corporation MICROSOFT ANNOUNCED ● high
4.145.16.192/26 Microsoft Corporation MICROSOFT ANNOUNCED ● high
4.145.18.62/32 Microsoft Corporation MICROSOFT ANNOUNCED ● high
4.145.18.136/30 Microsoft Corporation MICROSOFT ANNOUNCED ● high
4.145.19.42/32 Microsoft Corporation MICROSOFT ANNOUNCED ● high
4.145.19.43/32 Microsoft Corporation MICROSOFT ANNOUNCED ● high
4.145.19.48/30 Microsoft Corporation MICROSOFT ANNOUNCED ● high
4.145.19.52/30 Microsoft Corporation MICROSOFT ANNOUNCED ● high
4.145.19.64/28 Microsoft Corporation MICROSOFT ANNOUNCED ● high
4.145.19.80/31 Microsoft Corporation MICROSOFT ANNOUNCED ● high
4.145.19.82/32 Microsoft Corporation MICROSOFT ANNOUNCED ● high
4.145.20.102/32 Microsoft Corporation MICROSOFT ANNOUNCED ● high
4.145.20.116/30 Microsoft Corporation MICROSOFT ANNOUNCED ● high
4.145.20.120/31 Microsoft Corporation MICROSOFT ANNOUNCED ● high
4.145.21.64/27 Microsoft Corporation MICROSOFT ANNOUNCED ● high

Domains hosted in this network

what's this?
office.com microsoftonline.com live.com microsoft.com office365.com office.net sharepoint.com cloud.microsoft exp-tas.com msftncsi.com windows.com static.microsoft skype.com msedge.net usercontent.microsoft microsoft365.com msidentity.com windows.net akadns.net trafficmanager.net

Customer-delegated space

how is this classified?
Unclassified 62,839 (98.8%)
Operator infrastructure (named) 746 (1.2%)

Network trust

what's this?
RPKI hygiene: A how networks compare →
99.2% of checked blocks have valid RPKI ROA coverage (1,984 of 2,000, sampled from 63,585)
Possible discrepancies (1)

These blocks are registered to Microsoft Corporation but cryptographically authorized for a different, unrelated network (1 distinct holder) — often M&A history, multi-homing, or outsourced/managed hosting, occasionally worth a closer look.

2a00:2381:2a60::/48 /48 authorized for AS2856 — British Telecommunications Limited

NIC Handles

AB242-AP ABUSE5675-ARIN ACHMEA-NOC-MNT AE131-AP ALL-MNT AM2589-AP AMENET-MNT AS1103-MNT AS12076 AS17144 AS1849-MNT AS197959 +88 more