Office 365 endpoints management:

You can use the new web Service provided by Microsoft: https://endpoints.office.com/endpoints/Worldwide?ClientRequestId=3b2944f2-edb8-4e90-97c9-6190ef3ba696

Notice that the current XML file and old RSS feed will be available until October 2nd, 2018

A PowerShell script can be used to query the Web service:

The extract of this PS script can be generated in different format (i.e.  JSON, CSV, txt…)

 

Other reference articles:

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

Else using PowerShell scripts:

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

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