he WHOIS directory is a public listing of domain names, and people or organizations associated with each domain name.
As a privacy measure, some domain name owners prefer to have their personal information hidden from the WHOIS directory. This is similar to the way someone may want his/her personal telephone number unlisted in a local telephone book.
The WHOIS directory is used to determine the owner of domain names and IP addresses. There are many free web-based directories available on the Internet. The information provided in the WHOIS directory includes a mailing address and a telephone number.