Plain-language answer: ITU Radio Regulations allocate frequency ranges internationally by region; administrations license their national use, while amateur band plans coordinate modes and activities within those legal limits.
Why operators care
Allocation, license privileges, and voluntary band planning are related but not interchangeable. The legal answer depends on the operator’s country, class, mode, bandwidth, and current rules.
How to use it well
Check the current national regulator first, then the applicable regional or national amateur band plan before operating.
The common mistake
Using an international allocation chart as if it were a complete local license authorization.
Operating boundary
Predictions, reports, schedules, and mode descriptions guide a decision; they do not override current regulations, equipment limits, exact station conditions, or what the operator verifies on air.
