$ORIGIN kolya.net.
$TTL 3600
@               SOA     ns1.sipb.org. kolya.mit.edu. (
                        2004051600      ; serial, add 1
                        3600    ; refresh every 1 hour
                        300     ; retry every 5 min
                        604800  ; expire after 1 week
                        3600 )  ; minimum 1 day