From The RadioReference Wiki
In scanning and radio frequency uses, we often refer to a bandwidth of spectrum as a "band". These "bands" are frequencies that exist in a continuous range and usually have a common characteristic which identify it as a type of band.
These bands are divided by the area of the spectrum in which they are located. Those "bands" are commonly accepted to conform to the following table:
|ELF||Extremely Low Frequency||< 3 kHz||> 100 km|
|VLF||Very Low Frequency||3 kHz - 30 kHz||100 km - 10 km|
|LF||Low Frequency||30 kHz - 300 kHz||10 km - 1000 m|
|MF||Medium Frequency||300 kHz - 3 MHz||1000 m - 100 m|
|HF||High Frequency||3 MHz - 30 MHz||100 m - 10 m|
|VHF||Very High Frequency||30 MHz - 300 MHz||10 m - 1 m|
|UHF||Ultra High Frequency||300 MHz - 3 GHz||1 m - 10 cm|
|SHF||Super High Frequency||3 GHz - 30 GHz||10 cm - 1 cm|
|EHF||Extremely High Frequency||30 GHz - 300 GHz||1 cm - 1 mm|
- Radio Spectrum Management and Allocations - Has links to spectrum charts and and allocation tables.
- Wikipedia electromagnetic spectrum article