host:/var/lib/named/etc/bind# cat /etc/bind/zones/120.26.186.91.in-addr.arpa
$ORIGIN 120.26.186.91.in-addr.arpa
$TTL 86400
@       IN      SOA     ns1.foutrelis.com.      root.foutrelis.com. (
                        2007092203 ; serial
                        21600      ; refresh after 6 hours
                        3600       ; retry after 1 hour
                        604800     ; expire after 1 week
                        86400 )    ; minimum TTL of 1 day

IN      NS      ns1.foutrelis.com.
IN  NS  ns2.foutrelis.com.
IN PTR foutrelis.com.