4X/4Z Callsign Allocations

The following callsign blocks are currently in use:

Class A (Advanced): 4X1 and 4Z1 callsign series

Class B (General): 4X4, 4X5, 4X6, 4Z4 and 4Z5 callsigns (with a 2 letter suffix). Some Advanced ops prefer to keep their General callsign.

Class C (Novice): 4Z9 callsigns (3 letter suffix)

Class D (Technician): 4Z7 callsigns (3 letter suffix) – no longer issued.

Other formats:

4Xna or 4Zna (examples: 4X4S, 4X7T) – contest calls and special event stations

4X, 4Z followed by a number and letters – special event stations