autodns-dhcp_cron(1) on Linux
The text 9201504b947e, as Debian 10 (Buster), Debian 9 (Stretch), Debian 8 (Jessie), Debian 7 (Wheezy), Debian 6.0 (Squeeze), Debian 5.0 (Lenny) shipped it. The page shows this text now.
a cron script to check for changes to the dhcp.leases file