This following documentation from Microsoft outlines IP’s and URL’s that should be whitelisted.

Add IP addresses and URLs to allow list – Azure DevOps | Microsoft Docs

In addition to what’s documented, whitelist the following IP’s:

52.186.101.40

168.62.52.104

The most important pieces from the linked article are :

IP addresses and range restrictions

Ensure the following IP addresses are allowed for outbound connection, so your organization works with any existing firewall or IP restrictions.

IP V4 ranges IP V6 ranges
13.107.6.0/24 2620:1ec:4::/48
13.107.9.0/24 2620:1ec:a92::/48
13.107.42.0/24 2620:1ec:21::/48
13.107.43.0/24 2620:1ec:22::/48
   

Ensure the following IP addresses are allowed for inbound connection, so your organization works with any existing firewall or IP restrictions.

East United States 20.42.5.0/24
East 2 United States 20.41.6.0/23

 

Other IP addresses

  • 40.82.190.38
  • 52.108.0.0/14
  • 52.237.19.6
  • 52.238.106.116/32
  • 52.244.37.168/32
  • 52.244.203.72/32
  • 52.244.207.172/32
  • 52.244.223.198/32
  • 52.247.150.191/32

URLs to support sign in and licensing connections

  • management.core.windows.net
  • login.microsoftonline.com
  • login.live.com
  • go.microsoft.com
  • graph.microsoft.com
  • app.vssps.dev.azure.com
  • app.vssps.visualstudio.com
  • aadcdn.msauth.net
  • aadcdn.msftauth.net