ITU Radio prefix history
Explore how international radio call-sign prefixes have been allocated by the International Telecommunicatioms Union over time.
Search results distinguish radio prefixes from country codes.
Explore an allocation year
20261906–2026
19062026
Allocations in 2026
Prefixes allocated in this year.
Follow a prefix through time
Choose a radio prefix from the search results or annual list to see its allocation history.
I acknowledge the Traditional Owners of the lands throughout Australia on which these federal divisions are drawn and pay my respects to their Elders, past and present.