Get the subdomain from a URL

Posted by jb on Stack Overflow See other posts from Stack Overflow or by jb
Published on 2008-11-13T23:54:05Z Indexed on 2010/04/03 20:13 UTC
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subdomain

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url

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parsing

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dns

Getting the subdomain from a URL sounds easy at first.

http://www.domain.example

Scan for the first period then return whatever came after the "http://" ...

Then you remember

http://super.duper.domain.example

Oh. So then you think, okay, find the last period, go back a word and get everything before!

Then you remember

http://super.duper.domain.co.uk

And you're back to square one. Anyone have any great ideas besides storing a list of all TLDs?

John

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