If the server at info.cern.ch goes away, i.e. there is no info.cern.ch to connect to so there is no way to find the new URL for it. A URN must be made to be resolvable sans its original resolution server. A name is a symbol that can act as a proxy for some object it represents. That symbol is assumed to be unique across all time and space. Life is a game.
Someone wins and someone loses.
Get used to it.