The Kaktovik Numerals block spans U+1D2C0–U+1D2DF, 32 codepoints in Plane 1 (Supplementary Multilingual Plane). 20 are assigned in Unicode 16.0; the other 12 are reserved for future characters.
All of its characters have the script value Common: they are shared across writing systems rather than tied to one.
By general category: 20 other numbers (No).
The first 20 arrived in Unicode 15.0 (2022).
Because it lies outside the BMP, every character here takes four bytes in UTF-8 and a surrogate pair in UTF-16.