Autonomous system
AS5761 MICROSOFT-CORP-MSN-AS-SATURN
Unclassified ARIN
Summary
Microsoft Corporation
enterprise legacy
MICROSOFT-CORP-MSN-AS-SATURN is one of Microsoft's smaller autonomous systems, registered to Microsoft Corporation in Redmond, Washington.
What it's used for
- A single announced IPv4
/24drawn from Microsoft's long-held corporate range, plus an IPv6/48. This is an edge or special-purpose AS, not the network that carries Azure or Microsoft's consumer services.
Notable
- Microsoft runs a family of ASNs rather than one. The bulk of its traffic rides its main global network, so a 256-address AS like this one is a corner of the estate rather than a representative sample of it.
- The prefix sits inside Microsoft's own registered corporate address space, so these addresses are company infrastructure rather than customer or tenant space.
This description is AI-generated, best-effort context — not authoritative, and provided without any guarantee of accuracy. Source, and how to suggest an edit.
Interconnection
Peering at a glance
Internet exchanges
No exchange port on file. Many exchanges publish no participant list, so this is not proof of absence.
Transit providers
1 upstream, 0 downstream and 2 adjacent networks observed; most-used upstreams first.
| AS | Network | Paths seen |
|---|---|---|
| AS8075 | Microsoft Corporation | 97 |
Exchange presence is recorded rather than inferred: the directory collected by Packet Clearing House (https://www.pch.net/ixp/data) on 2026-10-14, licensed CC BY-NC-SA 3.0. Transit is inferred from observed BGP paths, never declared by either party.
Address space
Summary
IPv4 1 prefixes · 256 addresses IPv6 1 prefixes
| Country | Name | Prefixes |
|---|---|---|
| US | United States of America | 2 |
Registry
Allocation record
- Registry
- ARIN
- Handle
AS5761- Registry name
- MICROSOFT-CORP-MSN-AS-SATURN
- Registrant
- Microsoft Corporation
- Abuse contact
- abuse@microsoft.com
- Registered
- 1995-10-12
- Last changed
- 2013-08-21
- Allocation
- assigned
Routing security
RPKI and IRR
- RPKI
- 100% valid · 2 valid, 0 with no ROA
- ROAs
- 3 authorising AS5761
- ASPA
- no ASPA record
- IRR
- 100% registered · 2 of 2 announcements
- Route objects
- 2 naming AS5761
Reputation
Classification and threat
Unclassified Not in the curated lists. Most of the ~80,000 allocated ASNs are not.
Spamhaus DROP
Not on ASN-DROP The network as a whole is not listed.
No DROP prefixes None of its announced space is on the DROP prefix list.
Spamhaus DROP ("Don't Route Or Peer") lists space and networks run by, or hijacked for, spam and cybercrime operations: 442 networks and 1,772 prefixes, as published 2026-10-15. A short, high-confidence list, so a match is worth taking seriously, and absence from it says little on its own.
FBI IC3
No IC3 indicators Nothing from the FBI IC3 feed.
IC3 threat data is alpha. Absence of an indicator is not evidence of good behaviour, only of absence from this one feed.
Elsewhere