While even the mere existence of WHOIS data is largely unknown for
average users of the Internet, they serve as a basis of many practical and
fundamental task of IT operation, cybersecurity, Internet research and a many other
important and challenging areas. In the present blog we introduce WHOIS data briefly
and demonstrate their use with a guided tour around some of the applications. We
shall not address cybersecurity here: it is a very broad field of outstanding
importance itself, so it will be treated in a separate blog.