You may or may not need the IP addresses depending on your registrar.
How long does it take before my domain name is active?
Once your domain name has been registered or transferred, it usually takes about 36-72 hours
before it is active. All Internet providers must update their records (DNS files) to reflect
the new site's location.
Can I transfer my web site to DLS Web Hosting?
Yes, there is an option in the sign up process to note that this is a transfer.
You must then change your nameservers that are set at your registrar.
To see how this is done, we have tutorials for several registrars. If yours is
not listed, you will still get a very good understanding on how it is done.