I want to learn how you can do or is there any tool to do a search field in a website which basically you enter a domain name and it search if the domain is available or not.

Basically this you can find it in web hosing websites - when you register a new domain.

How this can actually be done and implemented ?

Thanks

One easy way is to become an affaliate, say for GoDaddy. They provide you with some code that you can include in your website. People can search using this box and if they purchase a domain name, you receive a percentage of the sale.

OR maybe you access any hosting website behind the scene and once you get some data then you display it to your users.

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