How to find my WHM mail server IP range to submit the outlook blacklist resolving form

https://support.microsoft.com/en-us/supportrequestform/8ad563e3-288e-2a61-8122-3ba03d6b8d75

After submitting the form I got this answer from the outlook support team.

Note: Errors are unlikely, however, if an error is indicated, please resubmit the specific IP or IP range.

I need some help to look for my ip range on WHM.