Using just the IP address to http://174.132.193.125 won't work - the web server doesn't know what you want.
If DNS is the problem you can add a line to the etc/hosts file (location depends on your system) like
174.132.193.125 www.amiga.org
You'd need to adjust the IP address in case a.org moves elsewhere but otherwise it'll do the trick.
He should be getting a Host Gator page otherwise the IP is blocked.