The IP for the JohnTech server is 50.80.72.195. JohnTech can also run many custom maps including favorites like
-Pirate Battle Royale!
-Super Smash Bros!
-Herobrine's Mansion!
-SethBling's Redstone Challenge!
To play one of these, or any other custom map you want, please contact me. I'll comment on this post whenever the server's up.