mac filter and asus rt-n56u

[OU812EC]

We are using the mac address for wifi security on our asus rt-n56u.

Does anyone know how many mac address the wireless mac filter can hold?

So far it seems that we can only put 16 mac address in the 2.4ghz screen and only 16 in tht 5.8ghz screen.

There has got to be a way to add more!

Is there a way to add more mac address the 32?

Thanks!!