There are two methods that have varying chance of success.
Method One:
1) You can use your domain's server IP address, plus your FTP login name like this:
http://x.x.x.x/~your_ftp_login_name
For instance, if the IP address for your server is 2.2.2.2 and your FTP login username is joe, you can view your site early using:
http://2.2.2.2/~joe
Case is significant on the login name and don't forget the tilde (~).
Method Two:
Open up your hosts file in your local computer. It is usually located in c:\winnt\system32\drivers\etc\hosts.