Tools
Domain Availability Checker
Enter a keyword to bulk-check multiple TLDs at once, or enter a full domain name for a single lookup.
About Domain Names
What Is a Domain Name?
A domain name is the human-readable address that identifies a website on the internet — for example, nuxtbase.com. It is made up of two parts: the name itself (nuxtbase) and the top-level domain or TLD (.com). When someone types your domain into a browser, the Domain Name System (DNS) translates it into an IP address that points to your server. Without a domain name, visitors would need to memorize a raw IP address to reach your site.
How Domain Availability Checking Works
When you search for a domain, the checker sends a query to the authoritative registry for each TLD using the RDAP protocol (Registration Data Access Protocol) — the modern, structured replacement for the older WHOIS system. The registry responds with the current registration record for that domain. If no active record is found, the domain is considered available to register. Results are typically returned within a few seconds per TLD.
What Is WHOIS and RDAP?
WHOIS is a long-standing internet protocol used to look up registration data for domain names, IP addresses, and autonomous systems. It returns details such as the registrar, registration and expiry dates, name servers, and sometimes registrant contact information. RDAP is its structured successor — it returns data in a consistent JSON format and supports access control, making it the preferred standard for modern domain lookups. Most major registries now support RDAP.
Why Some Domains Show as Uncertain
Not all TLDs expose public RDAP or WHOIS endpoints. Some country-code TLDs (ccTLDs) restrict access to their registry data, require authentication, or only allow queries through accredited registrars. Additionally, a domain may be in a redemption grace period (recently expired but not yet released) or in a pending-delete state. In these cases it is impossible to confirm availability without querying a paid registrar API. Domains in an uncertain state should be verified directly with a registrar before you assume they are free to register.
How to Choose the Right TLD
.com remains the most widely recognized and trusted TLD globally — if it is available at a reasonable price, it is almost always the best choice for a commercial product. For developer tools and SaaS products, .io, .dev, and .app have become widely accepted alternatives. Country-code TLDs such as .co or .so are often used as short, memorable alternatives. Avoid obscure TLDs unless they are directly relevant to your brand or audience, as they can reduce trust and make it harder for users to remember your address.
How Long Does It Take for a Domain to Go Live?
After registration, most domains become resolvable within minutes to a few hours as DNS records propagate across global nameservers. However, full propagation — where all DNS resolvers worldwide have updated their cache — can take up to 48 hours in edge cases. If you are pointing the domain to a hosting provider, you will also need to configure DNS records (A, CNAME, or NS records) correctly before the domain routes to your server. Using a registrar with a fast DNS network, such as Cloudflare, typically minimizes propagation time.