The Khitan Small Script block spans U+18B00–U+18CFF, 512 codepoints in Plane 1 (Supplementary Multilingual Plane). 471 are assigned in Unicode 16.0; the other 41 are reserved for future characters.
All of its characters belong to the Khitan Small Script script.
By general category: 471 other letters (Lo).
The first 470 arrived in Unicode 13.0 (2020); later additions came in 16.0 (1).
471 characters are East Asian Wide or Fullwidth and take two columns in terminals.
Because it lies outside the BMP, every character here takes four bytes in UTF-8 and a surrogate pair in UTF-16.