viewdns.info/whois
Domain / IP Whois is a ViewDNS.info tool. It displays owner/contact information for a domain name or IP address. It can also be used to determine if a domain name is registered or not.
Wpisy
mxtoolbox.com/Whois.aspx
You can check the domain here and get some informations about the owner. Also where the DNS is hosted.
webnames.ca/whois
Here you can check the domain and who owns it, as well as the location.
nominet.uk/whois/
This is registry for all .UK domain names. It also provide details of the registration.
whois.icann.org
ICANN gives anyone in the world immediate access to personal data about domain registrants if they type in the domain.
whois.net
Limited search for a selection of ccTLD’s and a few gTLD’s.
LINK: https://www.whois.net/
whois.domaintools.com
Find a new domain for your business or find all domains that contain your brand; advanced filtering lets you tailor your search to your specific needs.