The Authority Specified Format (ASF) could be any length. It contains a digital address of the recipient. The address is in the form of a Neda Subscriber ID, a phone number or some sort of PIN (Personal Id Number). The type of address it is will be identified by the AFI.
The Neda Subscriber Number assignment consists of two sets of three digits. The first set of three identifies the Neda Subdomain. The second set will be sequential.