The Mongolian block spans U+1800–U+18AF, 176 codepoints in Plane 0 (Basic Multilingual Plane). 158 are assigned in Unicode 16.0; the other 18 are reserved for future characters.
By script: Mongolian (155), Common (3).
By general category: 128 other letters (Lo), 10 other punctuation (Po), 10 decimal digits (Nd), 7 non-spacing marks (Mn), 1 dashes (Pd), plus smaller groups.
The first 155 arrived in Unicode 3.0 (1999); later additions came in 5.1 (1), 11.0 (1), 14.0 (1).