If you have an account with opendns you can turn that off, as well as do some nicer things like block adware and others (it won't stop the most determined of us

If you have an account with opendns you can turn that off, as well as do some nicer things like block adware and others (it won't stop the most determined of users but it works). Without an account opendns is no better than all the shady things many ISPs do nowadays so Google DNS and Level3 or running your own are the better options.