I am not an expert at networking, but I do know that as long as you have a wireless router the website is 192.168.1.____
If you have a windows computer I suggest trying them on that, even if you aren't going to host on that computer. If the site loads; just do it as if you were doing it on your mac, type in the last digits of your mac's IP that you set (Mines 192.168.1.45) and go. If you don't have a windows, try it on another mac, if you have only one computer; sorry bro.