depending on how you installed it but if you have installed it with the correct configuration, it should just be your ip address if i'm not mistaken.
its been years since i ran a webserver so have compeltely forgotten but try punching in the webserver's ip address on another machine and see how it goes
get the ip address from
http://whatismyip.com
and make sure correct ports are forwared on your router (if applicable)
sorry if my info is wrong.. but like i said it has been YEARS since i did anythin related. hope it helps in someway