I'm find some links which give messages like:

Firefox can't find the server at xxx.xxxx.xxx.

I check whether it is down for me or everybody and "It's not just you!".

Should I edit such questions or answers to make it clear the links are dead?

What if they come back to life?

I'm not sure my question is duplicate of What should we do about answers with Link Rot? because that is for "link only" answers and the link dies.