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We are setting up a list websites on our hosting account, but they each have a unique IP.

I was wondering if it was possible to have our host's nameservers override the actual nameservers the domains are currently hosted under.

We need to update the sites and setup software (wordpress, etc), but can't have any downtime.

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this question is not clearly written. – Keltari Aug 15 '11 at 18:08
I want to override the computers dns, so that it looks at ns1.mydns.com instead of ns1.theirdns.com – Jeremy Aug 15 '11 at 18:14
modify the .hosts file – Keltari Aug 15 '11 at 18:19
Your comment doesn't make things clearer. Do you want to change the DNS settings on the client computers (your own company's) or for everyone on the Internet, or what? Maybe you could draw a diagram? – CarlF Aug 15 '11 at 18:54
We have 500 wordpress sites, currently hosted on Godaddy (ns1.domaincontrol.net). We need to move hosting, but before we cut everything over, we need to set up all the wordpress blogs (which if you have set up, you know it makes you go to the real domain to get into the admin). So we cant cut over the NSs until the sites are setup on our other hosting. We want to use the new host's DNS while we set this up (either through overriding the default lookup or something). – Jeremy Aug 15 '11 at 19:38
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2 Answers

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No and if you understand how DNS/Name servers work, what you are asking for does not really make sense.

The IP part doesn't really make any difference, but, if you need to make the DNS for a domain resolve to a different DNS server, simple update the Name Server section on the domain in question. Different domain registrars have different ways of doing this, but, it should be pretty easy.

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We have 500 wordpress sites, currently hosted on Godaddy (ns1.domaincontrol.net). We need to move hosting, but before we cut everything over, we need to set up all the wordpress blogs (which if you have set up, you know it makes you go to the real domain to get into the admin). So we cant cut over the NSs until the sites are setup on our other hosting. We want to use the new host's DNS while we set this up (either through overriding the default lookup or something). – Jeremy Aug 15 '11 at 19:38
Use local hosts file and overwrite all the .coms (if you have a list) to 127.0.0.1 or whatever you need (if all these sites are on one server), then, after the move is finished, restore the hosts file. – William Hilsum Aug 15 '11 at 22:01
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Talk to your hosting provider and ask them. You'll need to know their DNS servers's TTL (Time To Live). That is basically how long they cache where your website will be. You'll need to setup the new site first, then during a slow time of the day, pull the plug on the old site.

All that is left is for your hosting provider's records to update.

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