asn.dev

Autonomous system

AS8070 MICROSOFT-CORP-MSN-AS-BLOCK

Hosting ARIN

IPv4 addresses 1.07M 28 prefixes
IPv6 prefixes 12 counted as prefixes, not addresses
Countries 1 mostly US
Exchanges 0 recorded by PCH
Upstreams 1 0 downstream
Flagged prefixes 0 none

Summary

Microsoft Corporation

Global · AI-generated

cloud hosting legacy

A large Microsoft Autonomous System in the MICROSOFT-CORP-MSN-AS-BLOCK range, announcing roughly a million IPv4 addresses of Azure and Microsoft service space.

What it's used for

  • Azure workloads and Microsoft's own online services. Its inventory spans both the classic Microsoft blocks (131.253.120.0/22) and the very large modern Azure allocations (20.34.0.0/15, 52.126.0.0/15, 57.16.0.0/14).
  • Some of it is Azure Government: addresses in 204.13.120.0/21 resolve to azuregov-dns.us nameservers.

Notable

  • An IP here identifies Microsoft as the host, not the operator of whatever is running on it — the same address block can front a first-party Microsoft endpoint or a customer's Azure deployment.
  • Reverse DNS is largely absent, which is normal for Azure. Microsoft publishes its service IP ranges as machine-readable lists precisely because you cannot infer them from DNS.

Interesting

  • The presence of Azure Government space means part of this AS is subject to a separate, isolated US-government cloud environment, even though the AS itself looks like ordinary commercial Microsoft space from the outside. See AS8069 and AS8075 for sibling Microsoft ASNs.

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

Full topology · Graph

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.

ASNetworkPaths seen
AS8075Microsoft Corporation2,350

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

Shape and geography

IPv4 28 prefixes · 1.07M addresses IPv6 12 prefixes

CountryNamePrefixes
USUnited States of America40

Registry

Allocation record

ARIN · via Atlas (registry + RDAP)
Registry
ARIN
Handle
AS8068
Registry name
MICROSOFT-CORP-MSN-AS-BLOCK
Registrant
Microsoft Corporation
Abuse contact
abuse@microsoft.com
Registered
1997-03-31
Last changed
2013-09-04
Allocation
assigned

Routing security

RPKI and IRR

Full detail
RPKI
100% valid · 44 valid, 0 with no ROA
ROAs
50 authorising AS8070
ASPA
no ASPA record
IRR
93% registered · 41 of 44 announcements
Route objects
49 naming AS8070

Reputation

Classification and threat

Hosting Datacenter or cloud provider. Addresses are servers, not people.

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 1,771 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

Cross-check