Office 365 IP Address changes

Occasional Visitor

Hello,

 

In order to allow Office365 Exchange IPs in a firewall, i'd like to use Microsoft's API stated in this page:
https://docs.microsoft.com/en-us/microsoft-365/enterprise/microsoft-365-ip-web-service?view=o365-wor...

Specifically using id 9 and 10.

 

My questions are:

1. Is this page/API mentioned in it(https://endpoints.office.com/endpoints/worldwide) consistent?

2. Are there pre-defined periods of time that these IPs/CIDRs change?

 

For example, if Microsoft will decide to add/remove an IP/IP range from mentioned above URL, can I be sure that there will not be a gap of time since the actual IP change and an update of that page?

 

Thank you in advance.

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