a good utility if you don't know your ips host name
http://www.sysinternals.com/Utilities/Hostname.html
Hostname is a very simply utility that takes either an IP address (e.g. 123.456.7.
, or a host name (e.g. ftp.ntinternals.com), and performs a translation into its inverse form. For example, if you pass Hostname an IP address, you'll get back a host name, and if you pass it a host name it will give you the corresponding IP address. It runs under Windows 95/98 and Windows NT/2K.