Managing Microsoft 365 endpoints
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Microsoft's commit message in MicrosoftDocs/microsoft-365-docs · commit 9a41914 · +1 −1 lines · also on GitHub
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1. Check if the IP address is included in a larger published range using a CIDR calculator, such as these for [IPv4](https://www.ipaddressguide.com/cidr) or [IPv6](https://www.ipaddressguide.com/ipv6-cidr). For example, 40.96.0.0/13 includes the IP Address 40.103.0.1 despite 40.96 not matching 40.103.
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2. See if a partner owns the IP with a [whois query](https://dnsquery.org/). If it's Microsoft owned, it might be an internal partner. Many partner network endpoints are listed as belonging to the _default_ category, for which IP addresses aren't published.
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3. The IP address might not be part of Microsoft 365 or a dependency. Microsoft 365 network endpoint publishing doesn't include all of Microsoft network endpoints.
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−4. Check the certificate. With a browser, connect to the IP address using *HTTPS://\<IP_ADDRESS\>* and check the domains listed on the certificate to understand what domains are associated with the IP address. If it's a Microsoft-owned IP address and not on the list of Microsoft 365 IP addresses, it's likely the IP address is associated with a Microsoft CDN such as *MSOCDN.NET* or another Microsoft domain without published IP information. If you do find the domain on the certificate is one where we claim to list the IP address, please let us know.
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+4. Check the certificate. With a browser, connect to the IP address using `https://<IP_address>` and check the domains listed on the certificate to understand what domains are associated with the IP address. If it's a Microsoft-owned IP address and not on the list of Microsoft 365 IP addresses, it's likely the IP address is associated with a Microsoft CDN such as *MSOCDN.NET* or another Microsoft domain without published IP information. If you do find the domain on the certificate is one where we claim to list the IP address, please let us know.
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### Some Microsoft 365 URLs point to CNAME records instead of A records in the DNS. What do I have to do with the CNAME records?
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