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The 'site:' operator already works in DDG how you describe.

DDG is mostly Bing under the covers for organic results, so most of Bing's advanced [0] searches will work in DDG.

Edit: Interestingly enough I can't get the 'IP:' operator to work in either Bing or DDG.

[0] http://help.bing.microsoft.com/#apex/18/en-US/10001/-1

Try the hidden param "sites"

http://duckduckgo.com/?q=duckduckgo&sites=stackoverflow.com

I think you want "inurl", see here: https://help.duckduckgo.com/duckduckgo-help-pages/results/sy...

yes, exactly, thank you. Not as powerful as a specific wildcard, but good enough.

sadly, it doesn't work with .something, so 'inurl:.co.uk' doesn't seem to work. Works with 'co.uk' but that's only valuable with longer suffixes. something like 'uk' is a bit too common.

"site:somewebsite.com some_search" works just fine on DDG.

sorry, just checked, it's the wildcard that isn't working. So 'site:*.co.uk'

"whatever site:uk" https://duckduckgo.com/?q=whatever+site%3Auk

Appears to work?

yep, that works, sadly .uk doesn't so domain endings that are commonly found in words can't be used.