Autonomous system
AS6584 MICROSOFT-GP-AS
Unclassified ARIN
Summary
Microsoft Corporation
enterprise legacy
MICROSOFT-GP-AS is one of the many autonomous systems registered to Microsoft Corporation in Redmond, Washington. It is a small, largely dormant AS, not one of Microsoft's production cloud networks.
What it's used for
AS6584 currently announces no IPv4 space at all. Its only announcement is a single IPv6 /48 carved out of 2a01:110::/32, RIPE-registered space whose parent block is named for Microsoft's corporate IT organisation rather than for Azure. Microsoft's public-facing cloud and content traffic rides on other numbers, chiefly AS8075.
Notable
An address in this AS is corporate-IT space, not cloud-hosting space. Anyone reasoning about Microsoft address space should be careful which Microsoft AS they are looking at, because the company operates dozens of them and they are not interchangeable.
The -GP- in the handle is a business-unit fossil of the kind that survives in ARIN records long after the unit itself is renamed or absorbed. ARIN registered the number in May 1996; Microsoft is the registrant of record today.
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 1 adjacent networks observed; most-used upstreams first.
| AS | Network | Paths seen |
|---|---|---|
| AS51964 | ORANGE BUSINESS SERVICES U.S. Inc. | 34 |
Exchange presence is recorded rather than inferred: the directory collected by Packet Clearing House (https://www.pch.net/ixp/data) on 2026-10-20, licensed CC BY-NC-SA 3.0. Transit is inferred from observed BGP paths, never declared by either party.
Address space
Summary
IPv4 0 prefixes · 0 addresses IPv6 1 prefixes
| Country | Name | Prefixes |
|---|---|---|
| US | United States of America | 1 |
Registry
Allocation record
- Registry
- ARIN
- Handle
AS6584- Registry name
- MICROSOFT-GP-AS
- Registrant
- Microsoft Corporation
- Abuse contact
- abuse@microsoft.com
- Registered
- 1996-05-30
- Last changed
- 2012-03-20
- Allocation
- assigned
Routing security
RPKI and IRR
- RPKI
- 100% valid · 1 valid, 0 with no ROA
- ROAs
- 8 authorising AS6584
- ASPA
- no ASPA record
- IRR
- 100% registered · 1 of 1 announcements
- Route objects
- 9 naming AS6584
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 1,778 prefixes, as published 2026-10-20. 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