The Devanagari Extended block spans U+A8E0–U+A8FF, 32 codepoints in Plane 0 (Basic Multilingual Plane). Every one of them is assigned in Unicode 16.0.
All of its characters belong to the Devanagari script.
By general category: 19 non-spacing marks (Mn), 9 other letters (Lo), 4 other punctuation (Po).
The first 28 arrived in Unicode 5.2 (2009); later additions came in 8.0 (2), 11.0 (2).
Most characters here are combining marks. See combining diacritical marks.