I have seen some have this: ~ in front of their host name ie: Nick [~Nick@hostname] when they join a channel. Is this something setup in mIRC itself or is it something who can be done if I run my own server?

Thanks in advance

The ~ is called a 'tilde' - you get it prefixed to your IdentD when you do not reply to the server's ident request. A lot of servers require you to have Ident enabled in order to connect. To get it enabled you often just need to type /identd on IdentHere and then connect. However, if that is not working (which is often caused by firewalls/routers) then see this thread.

You can also get to the IdentD options in mIRC via ALT+O > Connect > Identd.

Regards,

ah, thanks ... I was wondering too.