WHOIS Lookup and Domain Age Checker

Find a domain's registrar, registration and expiry dates, age, status and name servers, or who holds an IP range.

Try an example

Data from RDAP via rdap.org. Your browser sends the domain or IP address you enter (rdap.org redirects the request to the registry's own RDAP server) directly to RDAP via rdap.org; ToolsForThat does not see or store it. Registration data comes from the domain registry or regional internet registry that manages it.

Example

Input: github.com

Result: Registered 2007-10-09, expires 2028-10-09, registrar MarkMonitor Inc. (IANA ID 292), status client delete, transfer and update prohibited, 8 name servers, DNSSEC unsigned

From the Verisign RDAP server on 25 September 2026, reached through rdap.org. On that date the domain was 18 years, 11 months and 16 days old.

Common Domain Status Codes

Status	What it means
client transfer prohibited	Registrar lock against transfers to another registrar
client update prohibited	Registrar blocks changes to the domain details
client delete prohibited	Registrar blocks deletion
server transfer prohibited	The same transfer lock, set by the registry
client hold	Taken out of DNS by the registrar, so it does not resolve
auto renew period	Recently auto-renewed, still reversible
redemption period	Expired and deleted, but the owner can still restore it
pending delete	About to be deleted and released
active	Registered and working normally

RDAP writes EPP status codes as words, for example clientTransferProhibited becomes client transfer prohibited.

Enter a domain such as example.com, or an IPv4 or IPv6 address.
Press Look up or the Enter key.
Read the domain age and time to expiry at the top.
Check the registration dates, registrar, status codes and name servers below.
Use Copy summary to copy the main details as text.

What a Domain WHOIS Record Tells You

This WHOIS lookup shows when a domain was registered and when it expires. It also names the registrar and the name servers, and it works out the domain's age in years, months and days. For example, github.com was registered on 9 October 2007 and is managed by the registrar MarkMonitor.

Behind the scenes it uses RDAP, the Registration Data Access Protocol. ICANN made RDAP the official replacement for the old text-based WHOIS in January 2025. RDAP returns structured data, so dates and statuses come out clean. Your browser sends the domain to rdap.org, which redirects the request to the registry that runs that ending, such as Verisign for .com.

Status codes such as client transfer prohibited are normal locks that guard against hijacking, and the tool explains the common ones. Owner names, emails and phone numbers are usually hidden. Since GDPR took effect in 2018, most registries redact personal data by default, so a redacted contact is expected, not a warning sign.

Enter an IP address instead to see the network it belongs to. You get its name, CIDR range, organization and country, plus the regional registry, such as ARIN or RIPE NCC. Some country-code registries, including .de and .io, do not offer RDAP, and the tool says so when that happens. Results come live from the registry each time. To see the records a domain publishes, use the DNS Lookup. To test its email setup, try the SPF, DKIM and DMARC Checker.

Sources

Frequently Asked Questions

Look up its registration date. Enter the domain above and the tool reads the registration event from the registry and shows the age in years, months and days. The date is when the current registration began. If a domain expired and was registered again later, the age starts from the new registration.

Privacy law. Since GDPR in 2018, registries and registrars hide personal contact details by default, and many owners also pay for privacy services. To reach the owner, use the contact form or abuse address of the registrar shown in the results. Legal requests go through the registrar too.

Both give registration data. WHOIS is the old protocol: plain text on port 43, with a different layout at every registry. RDAP is its replacement, served over HTTPS as JSON with fixed field names, standard status codes and support for redacting personal data. ICANN retired the WHOIS requirement for generic domains in 2025.

It is a lock set by the registrar that stops the domain from being moved to another registrar. It is normal and protects against hijacking. To transfer the domain yourself, unlock it in your registrar account first. Server transfer prohibited is the same lock set by the registry, often for high-value names.

Those registries do not run an RDAP service, so there is nothing for this tool to query. Many country-code endings still publish data only through their own WHOIS server or website. The IANA root zone database lists the registry for each ending, and most have a lookup page on their site.

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