You found AS8075 behind an IP and want to know what it is. AS8075 is one of Microsoft's primary autonomous systems, covering Azure and Microsoft's online services. This page explains what runs on it and how to treat its traffic.
What is AS8075?
AS8075 is a main Autonomous System Number operated by Microsoft Corporation. It carries Microsoft services and a large part of Azure, so a route from AS8075 belongs to Microsoft's network. For the concept, see what an ASN is.
- ASN: AS8075
- Operator: Microsoft Corporation
- Type: Hosting / cloud (Azure and Microsoft services)
- Note: Microsoft publishes Azure IP ranges as downloadable service-tag files
What runs on AS8075?
Microsoft's own services (including Bing's crawler, Office 365, and Microsoft 365 endpoints) and a large amount of Azure infrastructure. Like other cloud ASNs, it mixes legitimate enterprise traffic with automation, since anyone can run an Azure VM.
Why you see AS8075 in your logs
AS8075 appears because Azure is a major cloud platform and Microsoft services are ubiquitous. Bingbot, for example, originates from Microsoft's network. As a data-center ASN, its traffic is server-originated and should be scored as such, while genuine Microsoft crawler traffic can be verified much like Googlebot.
Should you block AS8075?
No, not wholesale. Blocking Microsoft would cut off Bing indexing and legitimate enterprise and Azure-hosted services. Treat AS8075 as a hosting ASN, raise scrutiny where appropriate, and verify crawler traffic rather than blocking the network.
How to check an IP against AS8075
To confirm an IP is Microsoft, look up its ASN. Abstract's free ASN Lookup tool returns the ASN, operator, and type for any address. In code, the IP Intelligence API returns the ASN plus hosting and proxy flags in one request, so Azure traffic can be scored in real time. It is the data behind bot detection.
Frequently Asked Questions
What is AS8075?
AS8075 is one of Microsoft's primary Autonomous System Numbers, covering Azure and Microsoft's online services, including the Bing crawler.
Why is AS8075 in my logs?
Azure is a major cloud platform and Microsoft services are widespread, so AS8075 traffic spans legitimate enterprise services, Bingbot, and automation running on Azure VMs.
Is Bingbot on AS8075?
Genuine Bing crawler traffic comes from Microsoft's network. As with Googlebot, verify it by the originating ASN and Microsoft's published ranges rather than trusting the user-agent.
Should I block AS8075?
No. Blocking it would stop Bing indexing and legitimate Azure-hosted and Microsoft services. Treat it as a higher-risk hosting ASN and verify crawler traffic instead.
How do I check if an IP is Microsoft?
Enter the IP into Abstract's ASN Lookup tool or call the IP Intelligence API to see whether its ASN is AS8075.
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