Cant see some servers

This kindof falls into Steam problems but its only some gmod servers.

Ok so a week back 2 of my fav servers did not show up on my list.
I checked their website and it said there up!I tried to add the ip finding nothing.(Website uses tracker)

Internet stuff :
I just started using opendns 5days and 1 week ago cause charters DNS fucked up big time.

Yeah basicly its some gmod servers