$TTL 30
@        SOA nonexistent.nodomain.none. dummy.nodomain.none. 1 12h 15m 3w 2h
         NS  nonexistant.nodomain.none.

example.cz CNAME .
*.example.cz CNAME *.
nic.cz CNAME rpz-drop.
*.nic.cz CNAME rpz-tcp-only.
example.com CNAME rpz-passthru.