According to the position of the stars in the sky, how many sky regions does the International Astronomical Union divide the stars in the sky into?

The pre-cosmic constellation system was finally determined by the International Astronomical Union in 1928. Based on the traditional constellations, it divides the whole sky into three sky regions and 88 regions, and each region is a constellation. 29 in northern hemisphere, 47 in southern hemisphere, near celestial equator and ecliptic 12.