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Find Office 365 URL and IP

· 2 min read
Hannes Palmquist
Hannes Palmquist
Senior Consultant Cloud

Recently i published a new module PSDev with the purpose to group together a set of utility functions. Most of the functions are stand-alone and can be used independently of the module. The module is published to PSGallery for ease of access.

Install-Module PSDev -Scope CurrentUser

PSDev Module Docs

Function: Get-Office365IPURL​

The first addition to the module is the Get-Office365IPURL and Test-Office365IPURL functions. These functions simplify the process of getting a list of firewall rules for a given set of services and troubleshoot communication issues.

Get-Office365IPURL is used to get a detailed list of the rules. The Office 365 website combines, protocol, port and type of openings. This function will expand these rules based on these attributes. See the example below.

Get-Office365IPURL -Services Exchange -Types IP4,URL | Where-Object {$_.Required -eq $true}

Group                Service  Type Protocol Port Endpoint                           Required
-----                -------  ---- -------- ---- --------                           --------
Exchange_TCP_25_IP   Exchange IP4  TCP      25   52.100.0.0/14                      True
Exchange_TCP_25_IP   Exchange IP4  TCP      25   104.47.0.0/17                      True
Exchange_TCP_25_IP   Exchange IP4  TCP      25   40.107.0.0/16                      True
Exchange_TCP_25_IP   Exchange IP4  TCP      25   40.92.0.0/15                       True
Exchange_TCP_443_IP  Exchange IP4  TCP      443  40.96.0.0/13                       True
Exchange_TCP_443_IP  Exchange IP4  TCP      443  204.79.197.215/32                  True
Exchange_TCP_25_URL  Exchange URL  TCP      25   *.mail.protection.outlook.com      True
...

Get-Office365IPURL Docs

Function: Test-Office365IPURL​

Test-Office365IPURL is used to test weather a IP address is included within the ipranges provided by Microsoft. This could be useful of the firewall logs shows that a connection to an IP adress is blocked and there is a need to verify if that IP belongs to the ranges provided by Microsoft. See the example below.


Test-Office365IPURL -IP 52.109.76.22 | Where-Object {$_.ismember -eq $true} | Format-Table

RuleID ServiceArea TCPPort UDPPort Required Range         Subject      IsMember
------ ----------- ------- ------- -------- -----         -------      --------
    46 Common      80,443              True 52.108.0.0/14 52.109.76.22     True
    64 Common      443                 True 52.108.0.0/14 52.109.76.22     True
    65 Common      80,443              True 52.108.0.0/14 52.109.76.22     True

Test-Office365IPURL Docs