$ORIGIN 28.172.in-addr.arpa. $TTL 5m @ IN SOA dns.example. hostmaster.example. (1 0m 0m 0m 5m) 10.1 IN PTR moxacmepebble.mox1.example. 20.1 IN PTR moxmail2.mox2.example. 30.1 IN PTR dns.example. 40.1 IN PTR acmepebble.example. 50.1 IN PTR test.example. 60.1 IN PTR localserve.mox1.example. 70.1 IN PTR postfixmail.postfix.example.