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| Prefix | Timeline | History |
|---|
| Country / Entity | Prefixes Held | Active span |
|---|
ZZ — reserved (unavailable)
Unassigned / blank
Hover timeline segments for detail
120 years of ITU callsign prefix assignments, country by country, code by code.
| Prefix | Timeline | History |
|---|
| Country / Entity | Prefixes Held | Active span |
|---|