Does this show if a domain is available to register?

No, it validates the address format and, in the Advanced panel, shows public registration data if the domain is already registered.

Why did the registration lookup return no data?

Some registries restrict public RDAP data, or the domain may not be registered.

How can I check when a domain expires?

Enter the domain and review the public RDAP details when the registry provides an expiration date. Not every registry publishes complete dates.

Does the domain checker contact the registrar?

It reads publicly available registration data from RDAP services; it does not log in to an account or reserve a domain.

Website & DomainReady to use

Domain Checker

Check a domain's registration details and format; this tool does not claim that an unregistered domain is available to buy.

Guide

Interactive workspace

No account required

Domain Checker

Registration lookup (WHOIS/RDAP)

Look up the registrar, creation date, and expiry date from public RDAP registration data.

How to use it

Enter the domain name or public URL you want to check.
Run validation and review the normalized domain and public registration details.
Check registrar and date fields when the registry exposes them.
Use DNS Lookup or SSL Checker if you also need to inspect how the domain is configured.

What is Domain Checker?

Check domain availability, status, and structure in a simple browser-based validator.

How it works

SiteIndex validates that a domain or URL is well-formed and publicly routable, then the Advanced panel can query public RDAP registration data for the registrar, creation date, and expiry date.

Common uses

Confirm a domain address is valid before publishing or sharing it.
Check a domain's registrar and expiry date before it lapses.
Review registration status flags for a domain you manage or are evaluating.

Limitations

Results depend on the browser, network, input, and external service involved.
This tool is informational and does not replace specialist diagnostics or professional advice.

Frequently asked questions

Does this show if a domain is available to register?: No, it validates the address format and, in the Advanced panel, shows public registration data if the domain is already registered.
Why did the registration lookup return no data?: Some registries restrict public RDAP data, or the domain may not be registered.
How can I check when a domain expires?: Enter the domain and review the public RDAP details when the registry provides an expiration date. Not every registry publishes complete dates.
Does the domain checker contact the registrar?: It reads publicly available registration data from RDAP services; it does not log in to an account or reserve a domain.

Learn more

How to check DNS records
Understand the DNS records that help a domain route web traffic and email.
DNS record types guide
A plain-language reference for A, AAAA, CNAME, MX, TXT, NS, SOA, and CAA records.
How to check DNS propagation
Compare DNS results across multiple public resolvers to see whether a recent change has fully propagated.