The Kaithi block spans U+11080–U+110CF, 80 codepoints in Plane 1 (Supplementary Multilingual Plane). 68 are assigned in Unicode 16.0; the other 12 are reserved for future characters.
All of its characters belong to the Kaithi script.
By general category: 45 other letters (Lo), 9 non-spacing marks (Mn), 6 spacing marks (Mc), 6 other punctuation (Po), 2 format characters (Cf).
The first 66 arrived in Unicode 5.2 (2009); later additions came in 11.0 (1), 14.0 (1).
Because it lies outside the BMP, every character here takes four bytes in UTF-8 and a surrogate pair in UTF-16.