$TTL 3600 . IN SOA netreg.colby.edu. name-master.colby.edu. ( 2004071500 ; serial ; YYYYMMDDNN 1h ;refresh 10m ;retry 1w ;expire 1h ;negative caching TTL ) IN NS netreg.colby.edu. ; we want every IP on the planet to resolve to this ; except specific domains listed below netreg IN A 137.146.214.50 *. IN A 137.146.214.50 ; allow ungreistered machines to get to sophos sophos.com. IN NS netreg.colby.edu.