I'm not the mod who deleted it, but its clear why

While it was a ambiguous somewhat vague question, that required a certain degree of context to understand the intent was fairly clearly *not* what a Mac Address was  -and someone else clarified it with an edit, so it wasn't that obscure.. 

I suppose the lack of downvotes was cause downvotes cost rep, and comments and flags are free. Its just human nature. I'd add I'd have downvoted it if I was a regular user, but there's no specific need to do that.