I've been using whois.sc a lot for awhile, too. But, it seems there are a few domain registrars that doesn't allow public access to just basic details of the domain, such as GoDaddy. You must go to GoDaddy.com and use their specific tool to view a domain's information, even if it's whois was already private. :/ That's gotten quite annoying when I'm trying to find out abuse emails and contact emails.
Which tools do you use when looking up domain information?
Which tools do you use when looking up domain information?