How to show a block on specific pages using the Node ID instead of an URL? Using the "Show block on specific pages" on a block configure field, is it possible to use the Node ID in lieui of URL.

I.E.

412 instead of about/contact-us/
If you just want use the node id you can use node/[id].
Example: node/1

It will works even you are using a path alias, because that route is allways avaiable for any node.