1$TTL 86400 ; 24 hours 2$ORIGIN 0.0.127.IN-ADDR.ARPA. 3 40.0.127.IN-ADDR.ARPA. 86400 IN SOA localhost. root.localhost. ( 5 20120201 ; Serial 6 3h ; Refresh 7 15 ; Retry 8 1w ; Expire 9 3h ; Minimum 10 ) 11 86400 IN NS localhost. 121 86400 IN PTR localhost. 13