There is a thread "How do I show active dhcp leases" The thread is locked by Eric Carvalho while ALL answers there are only partial. I couldn't find a way to contact Eric personally (didn't find the inmail possibility).

I have spent 2 full workdays creating the working solution for the above problem mentioned in thread. Resulting Perl script is combining data from both log file and dhcpd.leases database and I would like to share it so that nobody else will have to repeat the whole process I went through.

The problemm is not so uncommon.