DHCPD

At some point before the lease expires, the client must re-request the same IP address if it wishes to continue to use it.

[3] This reference implementation of DHCP is developed by the Internet Systems Consortium[6] and is supported on Linux, Mac OS X, FreeBSD, and Solaris.

[7] Remote access to a running instance of dhcpd is provided by the Object Management Application Programming Interface (OMAPI).

[8][9] This API allows manipulation of the internal state of a running instance of the dhcpd server or client.

[10] ISC is developing a new DHCP software system, which is intended to eventually replace it.