Name for reverse zone

Hello:

This is probably a stupid question, but if the network address is
64.207.45.64/26 (the subnet mask is 255.255.255.192), would the zone
in the /etc/named.conf file be:

zone "64.45.207.64.in-addr.arpa" {
type master;
file "64.207.45.64.rev";
}

Would you need all four octets in the zone name because the subnet
mask isn't 255.255.255.0?

Thanks,
Jeff Keil