NONEXECUTABLE
Listing 2: Example Reverse Lookup File for the Example.com Domain

	210.168.192.in-addr.arpa. IN SOA dns.example.com. dnsowner.example.com.
	                              (19990930   ; serial # (date format)
	                                  10800   ; refresh (3 hours)
	                                   3600   ; retry (1 hour)
	                                 604800   ; expire (1 week)
	                                  86400)  ; minimum TTL (1 day)
	210.168.192.in-addr.arpa.  IN NS   dns.example.com.
	                           IN NS   ns1.ispexample.net.
	2.210.168.192.in-addr.arpa.    IN PTR    dns.example.com.
	4.210.168.192.in-addr.arpa.    IN PTR    mail.example.com.
	5.210.168.192.in-addr.arpa.    IN PTR    www.example.com.