The following call sign blocks are used for all radio communication, broadcasting or transmission:[1] In Morocco CN8 is for residents, CNØ is for visitors.
Nigeria further subdivides its prefixes thus: 5N1 = OGUN, OYO, ONDO; 5N2 = KWARA, KOGI, NIGER, OSUN; 5N3 = EDO, DELTA, ANAMBRA; 5N4 = ENUGU, RIVERS, ABIA; 5N5 = CROSS RIVERS, AKWA-IBOM, IMO, BENUE; 5N6 = PLATEAU, TARABA, BAUCHI; 5N7 = ADAMAWA, YOBE, BORNO; 5N8 = KANO, JIGAWA; 5N9 = KADUNA, SOKOTO, KEBBI, KATSINA; and 5NØ = LAGOS STATE AND ABUJA, F.C.T.
Senegal further subdivides its prefixes thus: 6W1 Dakar, 6W2 Ziguinchor, 6W3 Diourbei, 6W4 St. Louis 6W5 Tambacounda, 6W6 Kaolack, 6W7 Thies, 6W8 Louga, 6W9 Fatick and 6WØ Kolda.
The conference held in 1927 assigned call prefixes to Morocco (CNA–CNZ), Egypt (SUA–SUZ), Republic of Liberia (ELA–ELZ), Ethiopia (ETA–ETZ), and the Union of South Africa (ZSA–ZUZ).
The 1947 Atlantic City ITU Conference reallocated call sign blocks to African countries and European colonies according to this table.