As seen in the table below, the Very Low Frequency (VLF) band reaches from 3 kHz to 30 kHz.

Frequency name	Frequency	Application
Very Low Frequency (VLF)	3 - 30 kHz	Nil
Low Frequency (LF)	30 - 300 kHz	NDB/ADF
Medium Frequency (MF)	300 - 3000 kHz	NDB/ADF, long range communications
High Frequency (HF)	3 - 30 MHz	Long range communications
Very High Frequency (VHF)	30 - 300 MHz	Short range communication, VDF, VOR, ILS Localizer, marker beacons
Ultra High Frequency (UHF)	300 - 3000 MHz	ILS Glide Path, DME, SSR, Satelite communications, GNSS, Long range radars
Super High Frequency (SHF)	3 - 30 GHz	RADALT, AWR, MLS, Short range radars
Extremely High Frequency (EHF)	30 - 300 GHz	Nil

Mnemonic to remember the frequency names:
Very (Very Low Frequency)
Lovely (Low Frequency)
Maidens (Medium Frequency)
Have (High Frequency)
Very (Very High Frequency)
Useful (Ultra High Frequency)
Sewing (Super High Frequency)
Equipment (Extremely High Frequency)