$ORIGIN %c.in-addr.arpa.
@		IN	SOA	ns1.%d.	hostmaster.%d. (
			%s ; serial
                        3600 ; refresh
                        900 ; retry
                        1209600 ; expire
                        43200 ; default_ttl
			)
@		IN	NS	ns1.%d.
@		IN	NS	ns2.%d.
%h
