Data as of Nov 12, 2026
51.58.0.0/16
No anonymizer space · no proxy exits in 30 daysMicrosoft Corporation · space held by Microsoft Limited
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 | UK-Microsoft | Microsoft Limited (ORG-MA42-RIPE) · GB | LEGACY | Oct 6, 2016 | abuse@ |
| └ 51.58.0.0/16 | 65,536 | cloud | unknown | LEGACY | Sep 5, 2025 | abuse@ via UK-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 51.56.0.0/14
- Prefix
- 51.56.0.0/14
- Announced by
- AS8075 Microsoft Corporation
- Type
- Hosting
- RPKI
- RPKI valid
- Netname
- UK-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 51.56.0.0/14
51.56.0.0/14
Routing history
- Pattern
- Stable
- First seen
- Aug 2024
- Current origin since
- Aug 2024 · 2.3 yr
- Origin networks
- 1
RPKI
Route origin authorizations
| ROA prefix | ASN | Max len | Anchor | Verdict |
|---|---|---|---|---|
| 51.56.0.0/14 | AS8075 | /14 | RIPE | RPKI valid |
IRR
Route objects on 51.56.0.0/14
| Origin | Registry | Description | Maintainer | Modified |
|---|---|---|---|---|
| AS8075 | RADB | Microsoft | MAINT-AS8075 | Aug 12, 2024 |
Whois
Registration for this announcement
- Range
- 51.
54. 0. 0 - 51. 59. 255. 255 - Netname
- UK-Microsoft
- Registrant
- Microsoft Limited
- Registrant country
- GB
- Organization
- Microsoft Limited (ORG-MA42-RIPE)
- Org country
- GB
- Type
- LEGACY
- Created
- Oct 6, 2016
- Updated
- May 8, 2024
- 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