The IPA Extensions block spans U+0250–U+02AF, 96 codepoints in Plane 0 (Basic Multilingual Plane). Every one of them is assigned in Unicode 16.0.
All of its characters belong to the Latin script.
By general category: 95 lowercase letters (Ll), 1 other letters (Lo).
The first 89 arrived in Unicode 1.1 (1993); later additions came in 3.0 (5), 4.0 (2).