If you don’t have the ability to update DNS entries on you network but still need to associate or (dis-associate) a name to (from) an IP number you can use your HOSTS file located in C:\Windows\System32\drivers\etc. The # is used to comment
127.0.0.1 localhost 192.168.123.123 MyDevSharePointServer.MyDomain.Com 192.168.123.234 MyTestServer
Use shortcuts to go to your favorite websites:
126.96.36.199 f # Fark 188.8.131.52 g # Google
You can also block unwanted domain names from resolving by pointing them back to your local IP – 127.0.0.1.
127.0.0.1 IHateThisWebSite.Com # Never take me there again 127.0.0.1 NastyWebSite.Com # Ewww!