$TTL 3h @ SOA localhost. nobody.localhost. 42 1d 12h 1w 3h ; Serial, Refresh, Retry, Expire, Neg. cache TTL NS localhost. 1.0.0 PTR localhost. 1.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0 PTR localhost.