$TTL 1000 @ in soa localhost. postmaster.localhost. ( 1993050801 ;serial 3600 ;refresh 1800 ;retry 604800 ;expiration 3600 ) ;minimum a in ns ns.vix.com. a in ns ns2.vix.com. a in ns ns3.vix.com. b in a 1.2.3.4 a.b.c in ns b