Diagnostics

WHOIS / RDAP

RDAP is the structured successor to WHOIS. Paste a domain, an IP or an ASN and get its registration data: statuses, dates, registrar or organization, nameservers and DNSSEC.

Queries resolve via public RDAP (rdap.org and the authoritative registries) over HTTPS; they never pass through any redzilla server.

redzilla.cl — rdap

Look up a domain, IP or ASN to get started.

Runs locally in your browser · no sign-up · nothing leaves your browser

How it works

The tool looks up the registration data of a domain, an IP address (IPv4 or IPv6) or an ASN using RDAP, the structured successor of WHOIS standardized by the IETF (RFC 7480 through 7484, JSON responses per RFC 9083). The query type is auto-detected: AS15169 is treated as an ASN, 8.8.8.8 as an IP and iana.org as a domain, though you can also set it manually.

Queries go over HTTPS to rdap.org, a bootstrap service that redirects to the authoritative RDAP server of each registry (registrars, RIRs such as ARIN or LACNIC). The useful fields are extracted from the response: domain statuses, registration and expiration dates, registrar or organization, nameservers, DNSSEC, and for IPs and ASNs the range, CIDR and country. The full RDAP JSON remains available for inspection.

Example: checking when a domain expires

You enter example.com and the tool detects it is a domain and queries the RDAP server of the corresponding registry.
The result shows the registration date, the expiration date, the registrar and the current nameservers.
The statuses let you verify its protection: clientTransferProhibited means the domain is locked against unauthorized transfers.

Frequently asked questions

What is the difference between WHOIS and RDAP?

RDAP is the modern replacement for WHOIS defined by the IETF: it delivers the same registration data but as structured JSON, over HTTPS, with automatic redirection to the authoritative server and internationalization support. Classic WHOIS returns free-form text that differs per registry and is hard to parse consistently.

Why does the domain owner name not appear?

Since privacy regulations such as the GDPR took effect, most registries hide or anonymize the holder personal data. What is still published is the registrar, the dates, the statuses, the nameservers and the abuse contact, which is usually enough for diagnostics and verification.

What do I get when querying an IP or an ASN instead of a domain?

For an IP, the corresponding RIR (ARIN, RIPE, LACNIC, etc.) returns the block it belongs to: range, CIDR, allocation name, country and responsible organization. For an ASN, the number range, the network name and the organization. It is the standard way to find out who an IP belongs to.

Do the queries go through redzilla servers?

No. The browser queries rdap.org and the authoritative RDAP servers directly over HTTPS; redzilla never receives or stores what you look up. Note, however, that the query does go out to the internet, unlike the site calculators which run fully local.

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Disclaimer

We take great care to keep every tool accurate and review it thoroughly; even so, we can't guarantee it is free of errors or take responsibility for how the results are used. We recommend double-checking anything critical.

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