finding domain tools..

[qwe]

like is there any tools which can lets say show me which 3 letter domains are available ? or all 3 letter domain taken ? domain can have a number, like j8e.com or somthing... or which 4 letter are available... or site which shows expired domains ? help me out

[Randomonium]

You can do all of that and a whole bunch more at Webmaster Benefits