AS8070 — MICROSOFT-CORP-MSN-AS-BLOCK
Network type: hosting
AS8070 announces 28 IPv4 prefixes covering 1,073,920 addresses and 11 IPv6 prefixes.
About this network
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.
Announced prefixes
- 20.34.0.0/15
- 20.140.0.0/15
- 20.158.0.0/15
- 51.54.0.0/15
- 52.126.0.0/15
- 57.16.0.0/14
- 62.10.0.0/15
- 64.40.141.0/24
- 97.107.239.0/24
- 131.253.72.0/22
- 131.253.80.0/20
- 131.253.112.0/21
- 131.253.120.0/22
- 137.70.156.0/24
- 137.70.158.0/24
- 152.228.48.0/23
- 165.159.132.0/22
- 165.159.136.0/22
- 165.159.188.0/22
- 170.85.197.0/24
- 170.85.198.0/24
- 195.134.224.0/19
- 199.15.136.0/23
- 199.15.138.0/24
- 199.34.97.0/24
- 204.13.120.0/21
- 206.41.48.0/24
- 208.68.130.0/23
- 2001:489a:2000::/35
- 2001:489a:4000::/35
- 2601:9200:c001::/48
- 2601:9200:c003::/48
- 2601:9200:c004::/48
- 2603:1063:300::/40
- 2603:1063:2100::/40
- 2603:1063:7c00::/38
- 2605:4300:3601::/48
- 2606:e540:c02::/47
- 2607:9240::/46
Upstream networks
- AS8075 Microsoft Corporation
Adjacent networks
- AS8075 Microsoft Corporation
BGP / ASN / CIDR
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IPv4
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Search Results
IPv4 Prefixes
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IPv6 Prefixes
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Total Prefixes
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Unique /24s
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⚠ SUSPICIOUS PREFIX ANNOUNCEMENTS DETECTED