WHAT YOU CAN DO
Look up a single domain and view availability and public RDAP registration data.
Check the same name across your favourite domain endings.
Generate names from patterns and check them across multiple domain endings.
Or paste your own list of domains and check them in bulk.
Lookups run from your browser, not through a central lookup server.
We cannot see what names you are researching.
Save searches, favourites, notes and reusable patterns.
Use our AI prompt helper to create your own name patterns.
rdap.ai is a domain research tool for checking domain names, exploring availability, and viewing RDAP registration data. You can search a single domain, paste a list of domains, or use structured patterns to generate and test domain name ideas across different TLDs.
RDAP, or Registration Data Access Protocol, is the modern way to look up public domain registration data. It returns structured information about a domain name, registrar, registry and important dates where that data is available.
WHOIS is the older lookup system and usually returns plain text. RDAP is easier for tools to read, but the amount of data shown still depends on the registry, the TLD and privacy rules. Some contact details may be hidden or redacted.
RDAP was designed and built by the Internet Engineering Task Force (IETF) with implementation by gTLD registries and registrars mandated by ICANN since 28 January 2025. Since that date gTLD registries and registrars are no longer required to provide WHOIS services (except for .com, .name, and .post).
Country Code Top-Level Domains (ccTLDs) are not contractually or legally bound by ICANN policies, meaning ICANN's mandatory transition to RDAP does not apply to them. Each ccTLD (such as .uk, .de, or .fr) operates under its own local management (with government oversight), leaving the decision to adopt RDAP completely voluntary. In practice, many ccTLDs have already implemented RDAP, while others continue to rely on WHOIS or other lookup methods.
rdap.ai supports domain endings that publish RDAP services through the official bootstrap data. This includes many generic TLDs such as .com, .net and newer extensions, plus many country-code TLDs. See our TLD directory for a complete list of TLDs and their RDAP servers.
List searches let you paste your own domain names and check them in bulk. Enter one domain, word or phrase per line, choose the domain endings you want to test, and rdap.ai will look them up from your browser.
Pattern searches let you generate name ideas from a structured pattern, then check the generated names across one or more domain endings. This is useful for exploring brand names, product names, short names and themed domain ideas.
You can save searches, favourites, notes and reusable patterns in your workspace. This lets you pause domain research and come back to it later without rebuilding the same list or pattern from scratch.
Saved research is useful when comparing names across several domain endings, building a shortlist, or returning to a previous search after lookup limits or registry rate limits have cleared.
DDSL patterns are a structured way to describe sets of domain names. Instead of typing every possible name by hand, you can define word parts, choices and combinations, then generate a list of names to check.
For example, a pattern could combine prefixes, brandable word parts and selected domain endings. You can write patterns yourself, use examples, or use the AI prompt helper to create a pattern from a plain-language idea.
DDSL is an open specification. Read the DDSL spec on GitHub, or point an AI assistant at the DDSL reference for LLMs to generate patterns from a plain-English description.