Callsign blocks:- CL-CM CO T4. ISO 3166 code:- CUB.NA Timezone:- Amateur Allocations are as follows:- CO = Class A CM = Class B Digit indicates area:- 1 = Pinar del Rio 2 = Havana City 3 = Havana district 4 = Isla de Pinos 5 = Matanzas 6 = Las Villas 7 = Camaguey 8 = Oriente