Block from U+1B000 to U+1B0FF. This block was introduced in Unicode version 6.0 (2010). It contains 2 codepoints.
The Wikipedia provides the following information on block Kana Supplement:
Kana Supplement is a Unicode block containing archaic Hiragana and Katakana and Hentaigana.
Chart at Unicode.org (PDF)
Block at Decode Unicode