Here's a breakdown of ultrasonic and infrasonic frequencies:

* Ultrasonic: Frequencies above the range of human hearing, typically considered to be above 20,000 Hz (20 kHz).

* Infrasonic: Frequencies below the range of human hearing, typically considered to be below 20 Hz.

Important Note: The exact boundaries of "ultrasonic" and "infrasonic" can vary slightly depending on the context. For example, some sources might use a slightly higher or lower cutoff frequency for the upper limit of human hearing.