Creating domain name checker [closed]

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I wonder how to make a domain name checker (testing for availability) for top-level domains?

Eg. to check if the domain: stackoverflow.com or stackoverflow.dk is available or not.

Do I need to be subscribed to a service to do this, or is there some simple magic behind such test?

Thanks

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You need to do a WHOIS lookup - see http://www.aspdev.org/articles/build-whois-lookup-asp.net/

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It seems there is a protocol for this check "A Domain Availability Check". I am not sure if this is only for the german .de domains or for all domains. Maybe this will help you a little bit.

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Your best bet would be to create a webRequest object to fire off a whois request. You can then parse the results from the HTML using regex. I've done this on a number of occasions and it works well (providing the underlying website doesn't change)

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an helpfullweb service client http://www.whoislookup.be/wswhois/wswhois.asmx

referance

http://www.whoislookup.be/using-an-webservice-to-access-whois-search.aspx