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nslookup shows a host from a decommissioned DHCP scope

Posted on 2015-02-04
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Last Modified: 2015-02-09
Months ago I applied a new subnet mask to my network, allowing more hosts.  I took the IP addresses in question from the dynamic DHCP scope and assigned them as additional static addresses.  Today, I find that nslookup for IP addresses in the decommissioned dynamic scope shows me the hostname of a DHCP node that is actually at a different IP in the new dynamic scope.  The node I assigned as a static IP in this new static scope (the decommissioned range of my dynamic scope) shows the hostname that could only have come from a lease in the old network instead of the correct hostname.
The DHCP configuration on a Windows Server2008R2 domain controller looks right, but something got missed.  This is the only server in the domain with that role.
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Question by:HerrBall
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Rezwan Islam earned 500 total points
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Without assuming too much I would check into the following;

Try ipconfig /flushdns to see if that clears DNS cache.
May be check your DNS for any static DNS entry for that host.
Does the host have a second adapter / secondary IP?
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by:HerrBall
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Turns out that there was no static entry for the current hostname at that address..  I added some static addresses and enabled DHCP scavenging.  Thanks
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