Another name for domain is Internet web site. A domain is a specific location on the Internet. Persons wanting to get to a particular domain will have to know the web site address.
Domain refers to the value(s) X can be. I suppose "another name" could be "X value."
There are many places that you can check your domain name online. GoDaddy has a domain name search available for the consumer. Whois is another place to search for your domain name.
DNS stands for Domain Name System.
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Other names for Y value
Before obtaining a domain name consider how the domain name impacts SEO and the use of keywords. Another factor is branding and setting a distinction between the domain and others with similar names or products/services.
The company you buy the domain name through determines the cost of the domain name, so it is always best to compare prices. Usually (dot)com domain names are more expensive then (dot)net, or another ending.
A domain transfer is, in effect, to transfer domain name from the management under one registrar to another registrar. In order to process the transfer of your domain, you need to have domain already under your ownership and a registrar that you want to transfer that domain to.
The best name for a domain would be what it is used for. So it is a a matter of opinion. One person might really like your websites name and another person not.
First, come up with a domain name that you would like and then type it in. If a website pops up then that domain name has been taken. Then try another one and repeat the process.
If the question is whether you can buy the yahoo domain name, the answer is probably not. Theoretically you can purchase any domain name, however you would have to convince yahoo to sell, and it would be extremely expensive. If the question is whether you can purchase a domain name from yahoo, the answer is no, try another website such as BigDaddy