$TTL	60000
@		IN	SOA	40.30.20.in-addr.arpa.	nobody.nowhere. (
			1 ; serial
			28 ; refresh
			14 ; retry
			3600000 ; expire
			0 ; negative cache ttl
			)
@			IN	NS	50.40.30.20.in-addr.arpa.
50.40.30.20.in-addr.arpa.	IN	A	20.30.40.50

50	PTR	resdns.sillymail.com.