Callsign blocks:- TU. ISO 3166 code:- CIV.AF Timezone:- (daylight savings time applies) Amateur Allocations are as follows:- TU1 = Vhf/uhf/shf TU2 = Hf and vhf/uhf/shf TU3 = Experimental TU4 = Temporary licences (valid 6 months) TU5 = Hf and vhf/uhf/shf