It happens to the best of us. We rush through our Magento install and somehow misplace or forget to copy or bookmark the location of the admin URL. It is not something we normally have to go and find everyday, so we start searching for how to find it again.
A savy Magento admins know the best way to locate the Magento Admin Console URL is to just grab the location from [aMiSTACX for Magento 2.1.x] Path: /var/www/magento/app/etc/env.php
Open the file and look for the location that says ‘FrontName’ =>
Now just append the admin name ID to your Magento store URL and you’re in.
And for those that just love working from CLI or need to script a solution you have:
sudo php bin/magento info:adminuri [From Magento root directory.]