Reverse dns is not updating
By default, on a computer that is running Windows XP/2003 or newer, the Default Registration Refresh Interval key value controls this (except Windows 2000, whichdoes not have this key but can be added), and is set by default to 1 day.
This is true regardless of whether the computer is a client or a server, except domain controllers, which are every 60 minutes.
Well, I thought it’s time for an update and to just offer a summary in the beginning, because in this day and age, no one wants to read!
This is because the client will not update itself due to the current record in DNS is beyond the lease period.
This happens even though DHCP registered the record.
=============================================================== When a client shuts down, and later returns past the lease time, it may get a different IP address.
With the default settings, a duplicate A record gets registered by DHCP with the client’s new IP..================================================================= There are some misconceptions prompting fears that Scavenging will remove everything in your zone, includind servers.