Magento 2: How to retrieve admin URI?
You can get the details by below command in you Magento 2 instance.
php bin/magento info:adminuri
you can get the result like
Admin URI : /kqasuydi
Hope this is the simple and quick way to get.
You can get it from app/etc/env.php
file,
You have to get frontname from this file and suffix in your base url.
'backend' =>
array (
'frontName' => 'admin',
),
Now your value is http://127.0.0.1/magento2.1/admin
Remove cache and check in your browser.