Is there a way to show all routes used? I want to get a list (dump) of routes used?

Example:

/user/register
/user/logout
/custom/route
/node/27/some-description
If you are using the Drupal Console, you can use the command :

drupal router:debug


This will print all the routes on your site including routes from core.

The other solution is to use the Devel module and going to "devel/routes".