WHOIS is a query and response protocol used to query databases that store information about the owners of domain names and IP addresses. It also refers to the information collected and provided by this protocol.
How WHOIS works:
- Information query: When a WHOIS query is made for a domain name or IP address, a request is sent to a WHOIS server containing the relevant information about the resource in question.
- Server response: The WHOIS server returns detailed information about the owner of the domain name, including contact details, registration date, expiry date, associated nameservers and more.
- Public access: The information provided by WHOIS is generally in the public domain and available for anyone to query.
Common information provided by WHOIS:
- Registrant name: The name of the registered owner of the domain name.
- Administrative, technical and billing contact: Contact details of the registrant, including email address, phone number and postal address.
- Important dates: Domain name registration date, expiry date and update dates.
- Nameservers: List of nameservers associated with the domain name.
Uses of WHOIS:
- Ownership verification: Used to verify the ownership of a domain name and obtain relevant contact information.
- Security investigations: Helps identify and track domain owners linked to malicious online activities such as phishing, spam and fraud.
- Market analysis: Provides useful data for market research, such as identifying domain registration trends and domain name ownership within a specific industry.
It is important to note that some domain extensions may have privacy policies that conceal certain WHOIS information for privacy and security reasons. Additionally, in response to privacy concerns, some countries and organisations are reviewing and updating WHOIS policies to balance transparency with the protection of personal data.