Find an available domain

Check one name across many TLDs in a single call. DNS → RDAP → WHOIS cascade for an authoritative "is this domain free to register?" answer.

🔍 Try our API: https://api.lynk.run/domains/v1/check/example.com click to copy

⚡

Ultra-fast cascade

DNS catches taken domains in tens of milliseconds; RDAP and WHOIS confirm the rest. Many TLDs checked in parallel — a full sweep finishes in well under a second.

🎯

Authoritative, no guessing

RDAP is the registry's own API — a 404 means the domain genuinely is not registered. Verdict is available, taken or unknown; never a false "free".

🔑

One unified API

The same Lynk API key works across every service — Domains, Intel, BGP, Scraper. Also available as an MCP tool for AI agents.

Need more? Get your Lynk API key

Full access to the Domain Checker API. One key works across all Lynk services.

🔍 API Documentation

Integrate domain availability checks into your tools and workflows. View full API docs →

Batch Check

POST

https://api.lynk.run/domains/v1/check

Pass a bare name to fan out across tlds, and/or explicit domains. Max 50 domains per request.

curl -H "Authorization: Bearer lynk_your_api_key" \
  -H "Content-Type: application/json" \
  -d '{"name":"mycoolstartup","tlds":["com","io","ai"]}' \
  "https://api.lynk.run/domains/v1/check"

Single Domain

GET

https://api.lynk.run/domains/v1/check/:domain

curl "https://api.lynk.run/domains/v1/check/example.com"

Example Response

{
  "summary": { "total": 3, "available": 1, "taken": 2, "unknown": 0 },
  "elapsed_ms": 240,
  "invalid": [],
  "results": [
    {
      "domain": "mycoolstartup.com",
      "tld": "com",
      "status": "taken",
      "method": "dns",
      "reason": "domain is delegated (has NS records)",
      "checked_at": 1779480000000
    },
    {
      "domain": "mycoolstartup.ai",
      "tld": "ai",
      "status": "available",
      "method": "rdap",
      "reason": "RDAP: registry has no record for this domain (404)",
      "checked_at": 1779480000000
    }
  ]
}

⚠️ Important: status: "unknown" means no source could decide (registry blocked us, exotic TLD) — it does not mean "available".

🤖 Use with AI / LLM Agents

The Domain Checker is available as the domain_check MCP tool. Connect any MCP-capable agent (Claude Desktop, Cursor, Cline) — the full spec lives at:

https://api.lynk.run/mcp/llms.txt