As others have said, Kea is a DHCP server.

More than that, it is an ISC project, is the successor to ISC DHCP (now end-of-life & unsupported for a few years), and weirdly started out as part of BIND 10.

Ref: https://www.isc.org/dhcphistory/#the-kea-dhcp-server

(And I vaguely recall it's used as the DHCP component in a few other things, like maybe Infoblox).