content: On Windows systems, your host file will be C:\Windows\System32\drivers\etc\hosts with no extension. On Unix-based systems, it'll be /etc/hosts. If I remember right, they should both operate on the format of <IP address>, tab, <hostname>, with one entry per line. Any domain you don't want routed should be sent to 0.0.0.0. However, keep in mind some applications get cheeky and do their own DNS queries instead of using the  4683   OS to do it.