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I managed to create my domain controller and assigned an IP address of 172.100.8.x.
Now, I read up and found out that it was outside the Private IP Range (172.[16-31].x.x), so I really need to change this to something like 172.22.8.x or something.
Now, if I do, I will have to go into DNS and change everything in there and change my IP Address of my server. I havent added any workstations, I just configured the Server, so this is not the problem. My concern is that I will now have DNS problems from when I first configued the server in the 172.100.8.x range.
Now, should I spend more time and format my domain controller and redo my domain or should I stick with just changing the IP's in the DNS and change the IP Address of the Server? I don't want to have a messed up domain and DNS issues, I just made a big mistake when I deployed Active Directory, I put the Wrong IP Address and I just want to change it.

Your domain controller should be using the DNS server on itself. If you change your server's IP address it will auto-register itself with DNS. You shoudln't have to rebuilt anything. I've changed IP addresses on DCs many time without issues.

exactly doing a ipconfig /registerdns should do it....but worst case, just do a dcpromo and demote and promote it again...you shouldn't have to rebuild the whole server.

just do a dcpromo and demote and promote it again
^ this sounds dirty and i rather reinstall the server os, but i think that its okay, i didn't change any dns names, just ip addresses. if i have problems, then i would have to reinstall.

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