$ORIGIN 0.168.192.in-addr.arpa. $TTL 1D @ IN SOA nebula.eckard.biz. david.eckard.biz. ( 2003092301 ; serial 3H ; refresh 15M ; retry 1W ; expiry 1D ; minimum ) ;The nameserver. NS nebula.eckard.biz. ;Reverse DNS for the units connected to the local net. 1 PTR router.eckard.biz. 51 PTR orion.eckard.biz. 52 PTR nebula.eckard.biz. ;Reverse DNS for the broadcast address of the local net. 255 PTR broadcast.eckard.biz.