When making a BREQ_FAST request, do I have to include a network code?
No. You may use a wildcard instead of a specific network code. This can be either an asterisk (*) for all characters or a question mark (?) to wildcard a single character. Please consult the BREQ_FAST manual for further details. Be advised that there are over 90 networks that contribute data to the DMC, so wildcarding can be both very enabling, but inundating as well.