There is an option to allow users to verify/test the URL categorization used from the GUI under Objects > Security Profiles > URL Filtering Profile. This is handy to check while troubleshooting an issue or while configuring new URLs to determine what category needs to be allowed or blocked.
Depending on the URL filtering license that is activated, this link will open a web page to the BrightCloud or Palo Alto Networks website verification tool.
http://pandb.paloaltonetworks.com/test-(replace with category)
For the category that contains space characters, replace the space character with a hyphen. For example, for the "Recreation and Hobbies" category, the link will be: