How can I find a category by its ID in the magento backend?
and now it is possible :)
(felt like something quick to work on before shut eye)
This places an input box above the category tree in admin, and allows you to jump to any category id entered.
Largely untested, so please adjust as needed
in magento 2.1.5 you have 2 options :
1 - in your dashboard go to Products>categories , click the subcategory and watch the URL on your browser ..
for example : catalog/category/edit/key/046d4ea88011b68906d6d75032d0f478bf303fa968f2577508f0e59d312bad3b/id/43/
this subcategory has 43 id ..
2 - open your phpmyadmin and browse for your magento database > go to Url Rewrites table > search the page for the category name , after finding it look at the entity_id column ,,,