> > Is there a 65K limit on the size of a command?
>
> There are 2 limits on the size of a command:
>
> - The overall command is limited to 64KB

Correct

> - The BLR which is produced from the command can not be larger than 48KB

BLR limit also 64KB

> > Is there any way to increase the limit?
>
> No, the limits cannot be changed.

Correct again

All this limitations because of 16-bit variables used in ISC API

Regards,
Vlad