example.net 3600 A 5.6.7.8
3.5.7.9.in-addr.arpa. 3600 IN CNAME 2.4.6.8.in-addr.arpa.
2.4.6.8.in-addr.arpa. 3600 IN PTR reverse.example.com.
cnameptr.example.com 3600 IN PTR reverse.example.com.