The name hosts.rev is a generic name indicating the file's purpose and content. If you have more than one zone, each zone must have its own hosts.rev file and each of these zone hosts.rev files must have a unique name. For example, if your DNS domain is divided into doc.com and sales.doc.com zones, you could name one hosts.rev file doc.rev and the other sales.rev.
; SOA rec 6.45.123.in-addr.arpa. IN SOA sirius.doc.com. sysop.centauri.doc.com. ( 1997071401 ; serial number (YYYYMMDD##) 10800 ; refresh every 3 hours 10800 ; retry every 3 hours 604800 ; expire after a week 86400 ) ; TTL of 1 day ; Name Servers 6.45.123.in-addr.arpa. IN NS sirius.doc.com. 1 IN PTR sirius.doc.com.
A hosts.rev file contains these elements:
A Start of Authority (SOA) record
One or more Name Server (NS) records identifying master and slave DNS name servers. Server names should be fully qualified.
A PTR record for each host in the zone. Machine names should be fully qualified.
(SeeResource Record Types for detailed descriptions of these resource record types.)