Office 365 endpoints management:

https://docs.microsoft.com/en-us/office365/enterprise/managing-office-365-endpoints?redirectSourcePath=%252fen-us%252farticle%252fmanaging-office-365-endpoints-99cab9d4-ef59-4207-9f2b-3728eb46bf9a#configure-outbound-paths-with-pac-files

 

Did you see on the top of the URL below:

https://support.office.com/en-us/article/Office-365-URLs-and-IP-address-ranges-8548a211-3fe7-47cb-abb1-355ea5aa88a2

that you can subscribe to a RSS feed to be notified of the changes

and you can download the PAC or XML file:

Else using PowerShell scripts:

https://github.com/it-praktyk/Convert-Office365NetworksData

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