A domain age checker tells you how long ago a domain name was first registered. Type a domain, or paste any URL from the site, and this tool looks up the domain's public registration record through RDAP, the successor to WHOIS. It shows the age in years and months, the registration date, the expiry date and the registrar.
Domain age is counted from the registration date held by the registry. If a domain expired and someone registered it again, the registry usually shows the new date, so the age starts over. The registrar is the company the domain is registered through; it is not necessarily the company that hosts the site or the owner. The tool adds a short note: under one year is a new domain, one to three years is young, three or more is established.
Limits: the lookup runs from your browser through the rdap.org service. Most generic domains such as .com, .net and .org return data, but some country-code registries do not publish RDAP records or hide the dates. Domain age is not website age: a domain can sit parked for years before a site launches.