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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