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IPeek

WHOIS Lookup

Registration data for domains, IPs and ASNs

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What is a WHOIS lookup?

WHOIS reveals who registered a domain and when, which registrar manages it, when it expires and which name servers it uses. IPeek uses RDAP — the modern, structured replacement for legacy WHOIS — so results are clean and consistent across registries. You can also look up the organization behind an IP address or an ASN, not just domains.

How RDAP modernizes WHOIS

Legacy WHOIS returns free-form text that every registrar formats differently, making it hard to parse reliably. RDAP, the Registration Data Access Protocol, returns the same information as structured JSON over HTTPS, with standardized fields and consistent status codes. It also supports secure, authenticated access and clean referrals between registries. IPeek queries RDAP and presents the result in a uniform layout, so a domain registered through any registrar shows its dates, registrar, status and name servers in the same predictable place rather than buried in vendor-specific text.

How to read your WHOIS results

Focus on a few key fields. The creation date shows how old the domain is, the expiry date tells you when it must be renewed, and the registrar is the company managing it. Domain status codes like clientTransferProhibited indicate locks that protect against unauthorized transfers. Name servers reveal which DNS provider the domain points to. For an IP or ASN lookup, the result shows the owning organization and the allocated range, which is how you identify the network or hosting provider behind an address.

Why contact details are often redacted

Since privacy regulations such as GDPR took effect, registries and registrars routinely redact personal registrant details, replacing names, emails and addresses with privacy-protection placeholders or generic contact forms. This is expected, not an error. The administrative facts you usually need — registrar, creation and expiry dates, status codes and name servers — remain public, because they are operational rather than personal. When you do need to reach a registrant, the redacted record typically provides a forwarding contact or registrar abuse address instead of raw personal data.

Looking up domains, IPs and ASNs

WHOIS and RDAP cover three kinds of identifiers. A domain lookup returns registration data: registrar, dates, status and name servers. An IP address lookup returns the organization that owns the address block and the range it belongs to, which is how you identify a hosting provider or trace where a server lives. An ASN (Autonomous System Number) lookup returns the network operator behind a block of internet routing, useful for understanding who carries traffic for a service. IPeek accepts all three in one tool.

Frequently asked questions

What information does a WHOIS lookup show?

A WHOIS lookup shows a domain's registrar, creation and expiry dates, status codes and name servers. It tells you how old the domain is, when it needs renewal, who manages it and which DNS provider it uses. Personal registrant contact details are often redacted for privacy, but these operational fields remain public and are usually what you need.

What is the difference between WHOIS and RDAP?

WHOIS and RDAP return the same registration data, but RDAP does it better. WHOIS returns inconsistent free-form text that varies by registrar, while RDAP returns standardized JSON over HTTPS with consistent fields, status codes and secure access. RDAP is the modern replacement, which is why IPeek uses it to deliver clean, uniform results regardless of which registry holds the record.

Why is the registrant's contact information hidden?

Contact details are redacted to comply with privacy laws like GDPR, which restrict publishing personal data such as names, emails and addresses. Registrars replace them with privacy placeholders or a forwarding contact. This is normal. The operational fields you usually need, including registrar, dates, status and name servers, stay public because they describe the registration, not the person.

Can I look up who owns an IP address?

Yes. An IP lookup through RDAP returns the organization that owns the address block and the range it falls within, which identifies the hosting provider or network behind a server. It does not reveal an individual end user, but it does tell you which company is responsible for that address, useful for tracing where a site or service is hosted.

What is an ASN and why look one up?

An ASN, or Autonomous System Number, identifies a network that announces its own routing on the internet, typically an ISP, hosting provider or large organization. Looking one up returns the operator behind a block of internet routing. It is useful for understanding who carries traffic for a service, mapping a provider's address ranges, or investigating the network source of activity.