Block from U+11080 to U+110CF. This block was introduced in Unicode version 5.2 (2009). It contains 66 codepoints.
The Wikipedia provides the following information on block Kaithi:
Kaithi is a Unicode block containing characters historically used for writing Bhojpuri, Magahi, Awadhi, Maithili, Urdu, and other Hindi-related languages of the Bihar/Uttar Pradesh area of northern India.