How to create reverse DNS record in bind?

■ Purpose: Create reverse DNS record 
■ OS Environment: Linux
■ Application : bind
■ Assumption: Used C class address
■ Implementation Steps :

1. Add following lines in /etc/named.conf :

zone "0.168.192.in-addr.arpa" IN {
type master;
file "0.168.192.in-addr.arpa";
allow-update { none; };
};

2. Create zone for this reverse record :

$ vi  /var/named/0.168.192.in-addr.arpa  & put below entries

$TTL 600
@ IN SOA ns1.example.com. host.example.com. (
2012013001 ;Serial Number
86400 ;refresh
7200 ;retry
3600000 ;expire
86400 ;minimum

)

0.168.192.in-addr.arpa. IN NS ns1.example.com.
0.168.192.in-addr.arpa. IN NS ns2.example.com.
201 IN PTR example.com.