DNS advice wanted

Hi

I have a nameserver like this on my old server:
master.mydomain.no xxx.xxx.xxx.001
slave.mydomain.no xxx.xxx.xxx.002

Now, I want to keep the nameserver master.mydomain.no, but only change the ip because I have a new server both for nameserver and accounts, just like the old one. Some registrars is using form where only domain name can be typed, therefore, I can´t change the ip-address without removing the old server from the net ?


Regards,
Are

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