i think , 2 thing here , if for business purpose , u can go to
http://www.shellcentral.com/ and download it
if for personal use, which now u already have shell , then bnc not need , what u can do is
tunnel your irc to server , if ur workstation is linux then use this command
ssh -f
user@remoteserver.com -L localport:ircserver-ip:ircserverport sleep 30d
eg. ssh -f
user@remoteserver.com -L 6667:ircserver-ip:7000 sleep 30d
then open your irc program type /server localhost 6667
but if u are using windows u need to use putty for that