Actually I called it GDNS but well…that would be to cryptic as a blog item title. This is also from the KD-Team archives. Enjoy. All it does is *TRY* and find all sub domains for a given domain with the use of google.
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DiabloHorn 
Here it works, but it doesn’t get all the results. You could try looking into the regexp and see if google has changed the way they build links or something.
It doesn’t work for me… I tried yahoo, google and some other sites but it didnt give me any subdomains of these sites.