subnet 72.13.190.66 netmask 255.255.255.192 {
        deny unknown-clients;
        range 72.13.190.67 72.13.190.126;
        option subnet-mask 255.255.255.192;
        option broadcast-address 72.13.190.255;
        option routers 72.13.190.65;
        option domain-name "airstarnetworks.net";
        option domain-name-servers 4.2.2.2, 4.2.2.3;
        option netbios-name-servers 72.32.186.170;
        default-lease-time 21600;
        max-lease-time 43200;
        option time-offset -18000;


error

/etc/dhcpd.conf line 65: subnet 72.13.190.66 netmask 255.255.255.192: bad subnet number/mask combination.
subnet 72.13.190.66 netmask 255.255.255.192
                                        ^
Configuration file errors encountered -- exiting