yahoo ถ้าเปลี่ยน DNS ธรรมดา เพื่อย้ายไปที่โอสเรา ทำได้ปกติครับ
แต้่ถ้าหมายถึง private nameserver นี่ มีปัญหาครัย ทำได้แต่ต้องติดต่อเจ้าหน้าที่เรานั้น
http://help.yahoo.com/help/us/...dvanceddns/advanceddns-18.html 
How can I register new name servers?
If you registered your domain name through Yahoo! and want to host your own name servers, we'll be happy to register new ones for you. You can use the new name servers as backups for your Yahoo! name servers, or replace your Yahoo! name server settings with your own. Please be aware that Yahoo!'s name servers must be listed as the primary and secondary name servers in order for Yahoo! to host your domain services properly. If you replace Yahoo!'s default name servers, Yahoo! will no longer be able to provide any services associated with your domain.
Please note: Any changes that you make to your advanced DNS settings can interrupt your service. If you are not an advanced user, we strongly recommend that you do not change these settings.
To register a new name server host name, such as ns1.yourdomain.com, please send us an email including the information listed below. We'll use this information to verify your account and create your new name servers.
* Your Yahoo! ID
* Your domain name
* Your zip code, alternate email address, or date of birth (you need to provide only one)
* The last eight digits of the credit card used to pay for your account
* The type of credit card used
* A description of the record you are requesting, including the host names to be registered (such as ns1.yourdomain.com) and their valid IP addresses
Please allow up to 72 hours for your new name servers to be registered.
Please note that we can register new name servers for you only if you registered your domain through Yahoo! and your domain is no longer pending. If you signed up for your domain with another registrar, you will need to contact that registrar to create new name servers.
