Shortened zone file /etc/bind/db.example.edu.au: @ IN SOA bob.example.edu.au. root.example.edu.au. ( 2001060100 ;serial (version) 10800 ;refresh period (3 hours) 3600 ;retry interval (1 hour) 604800 ;expire time (7 days) 86400 ;minimum TTL (24 hours) ); IN NS bob IN NS fred IN MX 100 alice bob IN A 192.168.142.1 fred IN A 192.168.142.2 alice IN A 192.168.142.4