Answer by eddieringle · Jul 19, 2010 at 03:37 PM
If the server has an IRC daemon installed and you have DNS setup to point the domain to that server, then all you have to do is point an IRC client to yourdomain.tld:6667 (6667 is the default IRC port).
Answer by SpyderBite · Jul 24, 2010 at 02:21 AM
Setting up an IRC server is a 5 minute job when it comes to installation. Configuring it on the other hand can take quite a bit of time to do it right in regards to security, access, etc. For a small IRC server to share with friends or small business an in-house box will do just fine.
For an IRC server that is going to link with another IRC network then you'll want to co-locate. I co-lo a server from GoDaddy for around $99/month. Run an IRC server, Shoutcast server and all my hosted domains on it.
So, the answer is basically, $0 - $unlimited/month + setup depending on your intended use of the IRC server. :)