whois - used to have a feature of this - look up by the company name and listing of all of the sites registered - but they stopped this - are there any places that have this??

I've been looking for the same feature, but haven't found it yet.
I doubt it if you can find any :(

Try using the *nix tool "dig"

I was looking for the same thing.
Im not sure what the "dig" command does.
Anyone else have an idea on where to find all domains of one owner???