From The RadioReference Wiki

WACN stands for Wide Area Communications Network. In Project 25, the System ID identifies the system (for a given network). One or more systems may be joined into a network of systems. The WACN identifies the network. The WACN combined with the System ID will uniquely identify a system.

The WACN is normally displayed as a five digit hexadecimal number (digits 0-9 and letters A-F) followed by the three digit System ID.


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