webnames.ca/whois
Here you can check the domain and who owns it, as well as the location.
whoisip.se
With this you can easily make changes to IP numbers and get results about who owns the IP address instead.
LINK: http://www.whoisip.se/
itools.com/tool/arin-whois-domain-search
By this you can find for example IP addresses, autonomous system numbers (ASN), organizations or customers that are associated with resources.
whatismyip.com/ip-whois-lookup/
By this you can find the IP address owners contact information. Also the Regional Internet Registry (RIR) who assigns the IP, the assigned owner, location and so much more.
whoer.net/checkwhois
By this you can check the location of IP addresses, servers or websites. Also about the owner of domain and its contact details.
ultratools.com/tools/ipWhoisLookup
It finds contact information for the owner of a specified IP address.
nominet.uk/whois/
This is registry for all .UK domain names. It also provide details of the registration.
namecheap.com
By Domain Name Search you can check the domain. It also provides services on domain name registration, and offer for sale domain names that are registered to third parties.
LINK: https://www.namecheap.com/domains/domain-name-search.aspx
mxtoolbox.com/DNSLookup.aspx
This shows you list DNS records for a domain in priority order. DNS lookup tool will return an IP address if you give it a name.
LINK: https://mxtoolbox.com/