tool to help clean up dns and dhcp

[Gregory Machin]

Hi.

I'm started at a new job.

The dns / dhcp here is in a bit of a mess, a combination of not
clearing out records when machines are removed from the network and
miss-configured  ddns. I'm looking for a tool that will help me find
dead records so that I may know which IP's are free, and which static
leases can be deleted from the dhcp config.

Is there such a tool ?

Thanks