A registration lookup helps you understand the current administrative position of a domain: its registrar, recorded dates and status information. Domain investors have traditionally called this a WHOIS lookup. Today, for generic top-level domains, the current starting point is RDAP.
Use the result to guide your next checks, not to establish ownership history, domain value or auction availability on its own. A lookup describes registration data; it does not inspect the former website or tell you what a buyer will pay.
WHOIS and RDAP are different protocols
ICANN’s transition announcement identifies RDAP as the definitive source for generic-domain registration information from 28 January 2025. RDAP provides structured registration data with features including secure access and internationalisation.
A website may retain WHOIS in its product name while obtaining data through RDAP. The label alone does not establish what protocol or source it uses. Country-code registries can have their own services and rules, so check the relevant registry rather than applying generic-domain assumptions everywhere.
ICANN’s RDAP resource page explains the service and points to its lookup tools. Record which service you used and when. An old screenshot may no longer represent the current registration.
Read each field for the question it answers
| Field | Useful interpretation | Limit |
|---|---|---|
| Registrar | Identifies the sponsoring registration provider. | Does not establish where the domain is being sold. |
| Registration or creation date | Provides recorded timing for the registration. | Does not prove continuous operation of a website. |
| Expiry date | Helps identify a registration deadline. | Does not promise deletion or release on that date. |
| Status codes | Describe administrative conditions such as transfer restrictions. | Need the relevant registry and registrar context. |
| Nameservers | Show DNS delegation information. | Do not certify hosting quality or ownership legitimacy. |
| Registrant information | May provide information or a contact route when public. | Personal data can be redacted or otherwise unavailable. |
Use ICANN’s status-code guide for the definitions. For example, a transfer prohibition describes a restriction; it does not establish whether a seller is legitimate or whether the domain has a useful history.
Keep missing information marked as missing
Redacted contact fields are not evidence that the registration is suspicious. An absent public name also does not make the domain ownerless. Do not infer identity from a privacy service, registrar name or hosting company shown elsewhere in the result.
If a lookup fails, note the error and try an appropriate current service. A technical error, unsupported extension or missing public object is not a confirmation of availability. For a new registration, verify through a supporting registrar and review checkout. For a registered purchase, verify the sale route separately.
The registration and auction check guide explains how to combine those findings without confusing a lookup with a sale listing.
Apply the result to auction research
Imagine a candidate with an upcoming expiry date and a status preventing transfer. Those observations do not tell you whether its owner will renew, whether it will enter an auction or whether a transfer restriction can be removed for a particular transaction.
Search the actual auction platform for a current listing. Read the listing type and delivery terms, then save the listing identifier alongside your registration note. If no listing exists, mark the purchase route unconfirmed. Do not schedule a bid or backorder merely because a date looks promising.
For release after deletion, the deleted-domain workflow provides the next research steps. Each registry and registrar process needs its own checks.
Complete the evidence outside the lookup
Review archived content, relevant backlinks, naming fit, potential trademark conflicts and current renewal pricing. A record showing that a large company once held a name is not a valuation method. Nor does a registration date establish that old links or traffic remain useful.
Use the valuation guide when turning research into a budget. Keep registration data as one dated part of that research: valuable for administrative context, with clear limits on what it can prove.