Technical Library

Domain Name System

Introduction

Integration

zone            	IN      SOA     origin  contact (
                        	serial
                                refresh
                        	retry
                        	expire
                        	minimum )
zone                    IN      NS      name server name
in-addr.arpa address    IN      PTR      host1.zone.
in-addr.arpa address    IN      PTR      host3.zone.

All the hosts for the domain should have a reverse record here. If they have an A record in the forward named file, they need to have a PTR record in this file. If they only have a CNAME record, they do not need a reverse record.