Domain Availability Search — Check Online

This tool checks domain name availability via RDAP (Registration Data Access Protocol) — the modern registry data standard that replaced WHOIS. Popular TLDs are checked: .com, .ru, .net, .org, .io, and more.

What is RDAP?

RDAP is an IETF standard (RFC 7480) that replaced the WHOIS protocol. It returns structured JSON instead of unformatted text, and supports authentication and access control.

How Availability is Checked

• A request is sent to rdap.org — a universal RDAP proxy;
• HTTP 404 response → domain is available (DNS is also checked as a fallback);
• HTTP 200 response → domain is registered; registrar name and dates are parsed from the RDAP object.

Tips for Choosing a Domain

• Use short, memorable names without hyphens in the middle;
• .com is universal; .io and .dev are popular with tech companies and developers;
• Check for trademark conflicts before registering;
• Consider buying multiple TLDs to protect your brand.