DNS

https://www.duckdns.org

http://freedns.afraid.org/

http://www.dyndns.com/

http://www.no-ip.com/

http://www.opendns.com/

http://www.noip.com/

www.dnsomatic.com/

 

whois

http://www.domaintools.com/

http://www.tcpiputils.com/

https://viewdns.info/

https://dnslytics.com/

https://whois.domaintools.com/

 

darkweb search engine
http://dnmugu4755642434.onion