The extension detects a customer location (based on IP address) when he is placing an order and shows the location on the admin order page:
The extension’s code is on GitHub: https://github.com/mage2pro/customer-location
How to install
composer require mage2pro/customer-location:*
bin/magento setup:upgrade
rm -rf pub/static/* && bin/magento setup:static-content:deploy en_US <additional locales, e.g.: de_DE>
rm -rf var/di var/generation generated/code && bin/magento setup:di:compile
If you have some problems while executing these commands, then check the detailed instruction.