What WHOIS and RDAP do
Both are ways to access registration information. WHOIS traditionally returns text whose layout varies between providers. RDAP, the Registration Data Access Protocol, uses structured responses and supports features such as internationalized data and discovery of authoritative services. ICANN provides an overview of RDAP.
Domain Age uses registry RDAP records. It finds the service for a supported extension through IANA’s directory, requests the registered domain, and displays the fields the service returns. It does not query a website’s HTML to guess its registration date.
Read the main fields
- Domain: confirm that the returned name matches the registered domain you intended to check.
- Registration: the reported creation event used for our age calculation.
- Expiration: the reported end of a registration period, subject to the registry’s lifecycle rules.
- Last changed: a modification to the registration record, not necessarily a sale.
- Registrar: the registration provider identified in the record.
- Nameservers and statuses: operational details that require their own interpretation.
RDAP expresses dates as events with an action and timestamp. Its JSON response specification also defines entities, notices, and domain information. In a raw record, look for the events array rather than selecting the first date you see anywhere in the response.
Know the roles behind a domain
A registry manages the extension’s registration database. A registrar provides registration services to customers. A hosting provider serves website content. These roles may involve different organizations, so the registrar name does not necessarily identify the web host or the business operating the site.
For example, if the registrar field changes between two exports, record that as a change in reported registrar. Do not relabel it as a confirmed change in owner without additional evidence.
Why public records can be incomplete
Public lookup data is not a complete account history. Some information may be withheld or unavailable, and providers can publish different fields. ICANN’s RDAP information describes the protocol and the services required for generic top-level domains; coverage for a particular extension or tool still needs to be checked.
An absent registrant name does not, by itself, indicate misconduct. A missing creation event means the checker cannot calculate an age from that response. Neither a missing field nor a failed lookup proves that a domain is available to register.
Verify a result without mixing sources
Open the source link in your result, note the retrieval timestamp, and review any provider notices. If you compare another lookup service, record both timestamps and check whether each result came from a registry, registrar, or cached third-party database.
For consequential discrepancies, ask the registrar to clarify the relevant account details. Keep the disagreement visible in your notes rather than choosing whichever date looks more convenient. The troubleshooting guide helps separate missing fields from failed requests.