WHOIS: the phone book of Internet domains
WHOIS is a protocol and public database containing the registration information of every domain on the Internet: who registered it (registrant), when (creation date), when it expires (expiration date), through which registrar, and what the associated nameservers are. Born in the 1980s as a simple tool for identifying network administrators, WHOIS has become an essential tool for verifying domain ownership, commercial due diligence, and security investigations.
Our WHOIS Lookup queries the appropriate database for each TLD (top-level domain) and returns all available information. For .com and .net domains, the registry is Verisign. For .it domains, the registry is the Italian NIC. Each TLD has its own WHOIS server and its own policies on which information to make public. With the GDPR coming into effect in 2018, many registries significantly reduced the personal information visible in European WHOIS records.
Information in WHOIS
The most useful information: Expiration Date to check when the domain expires (and if you risk losing it), Creation Date to assess the domain's age (very young domains can be suspicious), Registrar to know where the domain is registered, Nameservers to identify the DNS provider, and Status to understand if the domain is locked, being transferred, or has restrictions. Combine with NS Lookup to verify that the nameservers are active and responding correctly.
WHOIS and security
In security analysis, WHOIS reveals valuable information. A typical phishing domain has: a very recent creation date (a few days old), a cheap registrar (often associated with abuse), active WHOIS privacy, and nameservers from free services. For business domains, WHOIS confirms the owner's identity and the site's legitimacy. Use our WHOIS Lookup as the first step to investigate suspicious domains in phishing emails.
For a complete view of a domain's health, combine WHOIS with SSL Check for the certificate and Domain Health for a full report on DNS, email, and security. WHOIS provides the administrative context (who, when, where), while other tools verify the technical configuration. Together, they form a complete picture for due diligence on any domain.
A practical note: always set up automatic renewal for your critical domains. Losing a domain due to non-renewal is one of the most costly yet preventable mistakes. If the domain expires, it enters a grace period (redemption period) during which it can be recovered, but at high cost. After the redemption period, the domain becomes available for public registration and could be purchased by third parties or domain squatters.