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The related question is asked here, and I cannot figure out it.

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It is called a DNS wildcard

As an aside (it's off-topic here): The standards are defined in RFC 4592. See also http://serverfault.com/questions/215042/dns-wildcard-vs-cname-subdomains

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Do you mean redirecting all subdomains to the main domain? A domain bin ?

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You might be looking for the term "URL canonization".

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5  
I think you mean URL canonicalization or URL normalization. Canonizing a URL is up to the Space Pope. – choster Jun 22 '12 at 16:04

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