You can whitelist 1, 2, 3 or 4 octets of your IP address. If the first octet of your IP address is always the same then whitelist 1 octet. If 2 octets of your IP address are always the same whitelist 2 octets, etc.
# whitelist 1 octet of your IP address Allow from 99. # whitelist 2 octets of your IP address Allow from 99.88. # whitelist 3 octets of your IP address Allow from 99.88.77.