Microsoft Azure at a Glance
| Type | Cloud platform |
|---|---|
| Website | azure.microsoft.com |
| Network (ASN) | AS8075 MICROSOFT-CORP-MSN-AS-BLOCK |
| Announced IP space | 1,210 IPv4 prefixes (~81,791,744 addresses), 117 IPv6 prefixes |
| Customer nameservers | None: keep your DNS provider and add the records from the dashboard |
Microsoft Azure Nameservers
Microsoft Azure does not ask customers to move their nameservers. Your domain stays with its current DNS provider, and you point it at Microsoft Azure with the A, AAAA or CNAME record shown in your Microsoft Azure dashboard (CNAME targets look like *.azurewebsites.net, *.cloudapp.azure.com, *.azurestaticapps.net). Verify the record afterwards with the DNS lookup.
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Microsoft Azure IP Ranges and ASN
Microsoft Azure announces its address space from one autonomous system. Any website whose IP address falls in these ranges runs on Microsoft Azure's network. Counts are from the global routing table on September 25, 2026.
| ASN | Registered name | Registry | IPv4 prefixes | IPv4 addresses | IPv6 prefixes |
|---|---|---|---|---|---|
| AS8075 | MICROSOFT-CORP-MSN-AS-BLOCK - Microsoft Corporation, US | arin · since 1997 | 1,210 | 81,791,744 | 117 |
Largest Microsoft Azure IP blocks
20.64.0.0/1020.192.0.0/1013.64.0.0/1120.0.0.0/1148.224.0.0/1152.160.0.0/1152.224.0.0/11107.32.0.0/112603:1000::/252a00:1c68::/29Look up any address in these blocks with the IP lookup or the ASN lookup.
How to Check if a Website Is Hosted on Microsoft Azure
Enter the domain in the checker at the top of this page. It names Microsoft Azure when one or more of these signals match, and lists each one as evidence:
- The site's IP address is inside AS8075, the network Microsoft Azure announces.
- The www record is a CNAME to *.azurewebsites.net, *.cloudapp.azure.com, *.azurestaticapps.net.
- The domain uses Microsoft Azure nameservers (*.azure-dns.com, *.azure-dns.net, *.azure-dns.org, *.azure-dns.info). This shows where DNS is managed, which is usually but not always the host.
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Microsoft Azure FAQ
What are Microsoft Azure's nameservers?
Microsoft Azure does not ask customers to switch nameservers. You keep DNS at your registrar or DNS provider and add the A, AAAA or CNAME record shown in your Microsoft Azure dashboard.
What is Microsoft Azure's ASN?
Microsoft Azure announces its IP addresses from AS8075 (MICROSOFT-CORP-MSN-AS-BLOCK, registered with ARIN).
How many IP addresses does Microsoft Azure have?
As of September 25, 2026, Microsoft Azure's network announces 1,210 IPv4 prefixes covering about 81,791,744 IPv4 addresses, plus 117 IPv6 prefixes (source: RIPEstat routing data).
How can I tell if a website is hosted on Microsoft Azure?
Run the domain through the hosting checker on this page. It reports Microsoft Azure when the site's IP address is inside AS8075, the network Microsoft Azure announces, and it shows every matching signal as evidence.
Is Microsoft Azure a web host or a CDN?
Microsoft Azure is a cloud platform: it provides cloud infrastructure: virtual machines, App Service, Static Web Apps, Front Door and Azure DNS.
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Microsoft Azure is a trademark of its owner. DNS Robot is not affiliated with Microsoft Azure unless an offer above is marked sponsored.