Applies To: Office for business, Office 365 Admin, Office 365 Small Business Admin, Office 2016 for Mac, Microsoft 365 Business
Last Update: January 7, 2019
Note: Microsoft is developing a REST-based web service for the IP address and FQDN entries on this page. This new service will help you configure and update network perimeter devices such as firewalls and proxy servers. You can download the list of endpoints, the current version of the list, or specific changes. This service will eventually replace the XML document, RSS feed, and the IP address and FQDN entries on this page. To try out this new service, go to Web service.
Start with managing Office 365 endpoints to understand our recommendations. Except for emergency changes, endpoints are updated at the end of each month….
Read the whole article on Support.Office.com:Office 365 URLs and IP address ranges