How we calculate domain age

Domain age is the elapsed time since the current registration date in a domain registry’s record. DomainAgeChecker reads that record using RDAP and calculates the age in calendar years, months, and days.

Methodology reviewed: October 12, 2026.

Where does the registration data come from?

We use the IANA RDAP bootstrap directory to find the HTTPS registration-data service for a domain extension. We request the domain’s public record from that service. Available fields can include registration, expiration and last-changed dates, registrar name, and domain status. Each successful lookup links to its source record and displays when the data was retrieved.

RDAP stands for Registration Data Access Protocol. Its structured responses and event fields are defined in RFC 9083. We use registration or re-registration events for the creation date. If the record contains several such dates, we use the latest valid one to describe the current registration. Missing or future creation dates are not used to invent an age.

How are years, months, and days calculated?

We compare the registration date with the lookup date using UTC calendar dates. We count complete calendar months, split them into years and remaining months, and then count remaining days. Month-end anniversaries are clamped to the final day of shorter months, including February in leap years. We do not divide elapsed days by 365.

For example, a registration dated January 15, 2020 has an age of 6 years, 2 months, and 5 days on March 20, 2026. This is a calculation example, not a live domain record. The registration period shown separately runs from creation to the reported expiration date; it is not the domain’s current age.

Why is website history separate?

The Internet Archive’s Wayback Machine captures web pages. We request the earliest and latest available successful homepage captures for the registered domain, separately from its RDAP lookup. Other pages and subdomains may have different capture dates. An archive failure does not change the registration result.

A capture shows that a page was archived on a particular date. It does not prove when the website launched, who owned it, or when the domain was first registered. A missing capture is not proof that no website existed.

How fresh are the results?

Registration records may be reused from a temporary server cache for up to five minutes. Successful archive responses, including empty results, may be cached for up to one hour; temporary archive failures may be cached for one minute. The domain age is recalculated at lookup time. Registry and archive publication delays can still affect the underlying data. Check the linked source before relying on a date for a purchase or renewal.

What can a domain age lookup not tell you?

A dropped domain can be registered again with a new creation date. Current registration data may not reveal its first-ever registration or previous owners. Some extensions have no supported HTTPS RDAP service in the IANA directory, and providers can omit fields or temporarily limit requests. An unavailable record or an old expiration date does not establish that a domain is available to buy.

Domain age is context, not a trust score or a guarantee of search rankings. Review a domain’s past content, reputation, and links separately. DomainAgeChecker is an independent tool; it is not a registry, registrar, or Internet Archive service.

Questions or data concerns?

Contact contact@domainagechecker.com with the domain, the field in question, and its source link. Please do not include passwords or private URL parameters. We can investigate how a result is displayed; changes to a registry record must be handled by the relevant registrar or registry.