Data as of Nov 10, 2026
51.145.0.0/16
1 residential-proxy exit · 30 daysMicrosoft Corporation · space held by Microsoft Limited
Residential-proxy exits
Proxy exits
1
<0.01% of its addresses · 30 days
Oct 11, 2026 – Nov 9, 2026
Exits seen per day
1 observation
Registrations in this block
The registry's network records over this block, widest first, each under its parent.
| Range | Addresses | Netname | Holder | Type | Created | Abuse contact |
|---|---|---|---|---|---|---|
| 51. | 393,216 | MICROSOFT | Microsoft Limited (ORG-MA42-RIPE) · GB | LEGACY | May 21, 2015 | abuse@ |
| └ 51.145.0.0/16 | 65,536 | cloud | unknown | LEGACY | Sep 5, 2025 | abuse@ 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
Announced by
Covering announcement 51.144.0.0/15
- Prefix
- 51.144.0.0/15
- Announced by
- AS8075 Microsoft Corporation
- Type
- Hosting
- RPKI
- RPKI valid
- Netname
- MICROSOFT
- Registrant
- Microsoft Limited
- 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
Routing timeline
Who has announced 51.144.0.0/15
51.144.0.0/15
Routing history
- Pattern
- Stable
- First seen
- Jul 2015
- Current origin since
- Jul 2015 · 11 yr
- Origin networks
- 1
RPKI
Route origin authorizations
| ROA prefix | ASN | Max len | Anchor | Verdict |
|---|---|---|---|---|
| 51.144.0.0/15 | AS8075 | /15 | RIPE | RPKI valid |
Whois
Registration for this announcement
- Range
- 51.
140. 0. 0 - 51. 145. 255. 255 - Netname
- MICROSOFT
- Registrant
- Microsoft Limited
- Registrant country
- GB
- Organization
- Microsoft Limited (ORG-MA42-RIPE)
- Org country
- GB
- Type
- LEGACY
- Created
- May 21, 2015
- Updated
- Jul 25, 2016
- Maintainer
- RIPE-NCC-LEGACY-MNT
- RIR
- RIPE NCC
- Country
- GB
- Delegated
- Sep 1, 1993
- Status
- assigned
Report abuse
Abuse contact
- abuse@
microsoft. com - Name
- Microsoft Abuse Contact
- Handle
- MAC274-RIPE