ITU Band nameAbbreviationFrequency and WavelengthExtremely low frequencyELF3–30 Hz 100,000–10,000 kmSuper low frequencySLF30–300 Hz 10,000–1,000 kmUltra low frequencyULF300–3,000 Hz 1,000–100 kmVery low frequencyVLF3–30 kHz 100–10 kmRadio spectrum – Wikipedia en.wikipedia.org › wiki › Radio_spectrum