Infrared radiation has a wide range of frequencies, but generally falls between:

* 300 GHz (1 mm wavelength) and 400 THz (750 nm wavelength)

Here's a breakdown:

* Near-infrared (NIR): 780 nm to 2500 nm (400 THz to 120 THz)

* Mid-infrared (MIR): 2500 nm to 50,000 nm (120 THz to 6 THz)

* Far-infrared (FIR): 50,000 nm to 1 mm (6 THz to 300 GHz)

Remember that this is a very general range, and the specific frequencies of infrared radiation can vary depending on the source and the application.