Seems similar yet still useful to Wolfram Alpha; just enter a domain and click on the "Subdomains" button: https://www.wolframalpha.com/input?i=ycombinator.com

Seems similar yet still useful to Wolfram Alpha; just enter a domain and click on the "Subdomains" button: https://www.wolframalpha.com/input?i=ycombinator.com https://www.wolframalpha.com/input?i=ycombinator.com