Can I easily re-use a domain controller's hostname and IP after its removed?

I have two Windows Server 2003 domain controllers that a lot of systems (100+ hosts) on our network point at for their DNS.  For the sake of explaining I'll call them Old1 and Old2.

After I have demoted the DCs Old1 & Old2 and removed them from the domain, could I re-use their names and IP addresses without any problems occurring?  They will be demoted and then their computer objects deleted.

Ideally to save having to change all the systems to point at a new DNS server, I'd like to build 1 new 2012 DNS server that has the same names and IP addresses

i.e. the new 2012 DNS server (not a domain controller), will :

- be called Old1 but also have an A record in DNS that points Old2 at Old1
- have two network adaptors,  one using the same IP as Old1,  and the other as Old2

I would hope that DNS requests made to either the two IP addresses,  or to either hostnames Old1 or Old2,  will respond correctly.

Does that make sense or need more detail?

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JohnBusiness Consultant (Owner)Commented:
I am not sure about the name. You probably can re-use it, but I would not. Use a new name.

The IP addresses can certainly be re-used. We are setting up a server right now and re-using IP addresses that had been used by an old server now gone.
Will SzymkowskiSenior Solution ArchitectCommented:
As long as you demote the Domain Controllers gracefully and all of the objects are removed during this process you can reuse the names and ip addesses, without any issue.

have two network adaptors,  one using the same IP as Old1,  and the other as Old2
As for the statment above, you do not need to have 1 IP on each NIC. What you can do is assign 2 IP's to the Same NIC.

This is a more suitable action because when you have 2 NIC configured on a machine and they are not TEAMED you can only have 1 default gateway on either of the NIC's you cannot have a default gateway assigned to both.

So the best method is to add a second IP address to NIC1.

Aside from that it will be fine.


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In general, when you demote a domain controller, all entries for the DC are removed (save anything that allows the DC to remain a domain member server).  Then once you remove the machine from the domain (by placing it in a workgroup) all entries are removed for the domain member.


Not necessarily.

There are settings within Active Directory that prevent automatic removal of deleted records (especially with regards to DC's).  Not to mention that you can sometimes end up with orphaned records.

Jack's Blog has some good information concerning this -

I see no problem with reusing either.  Just make sure everything's cleaned up as Will mentioned.  I would just change your new DCs (with DNS) to have the IPs of the old DCs.  Why mess with this "intermediate" DNS?  Seems unnecessary to me.
I second both Will and foo with regards to an intermediary DNS.  It does seem unnecessary.

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Windows Server 2003

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