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MCP servers · domains

RDAP (domain lookup) MCP server

Public domain registration data — registrar, status, created/expiry dates, nameservers — straight from the registry (the modern WHOIS). Hosted by 0n3: 4 endpoints your AI can call with your own RDAP (domain lookup) account, from Claude, ChatGPT, Cursor, Claude Code, Codex or Gemini CLI. One sign-in, one key per AI, a receipt for every call.

Connect RDAP (domain lookup)Install into your AIWatch it work

4 endpoints2 categoriesauth: nonehosted

What your AI can do with RDAP (domain lookup)

Lookup · Look up a domain, nameserver, IP network or autonomous system0
Look up a domain, nameserver, IP network or autonomous system
More · Everything else this app exposes.4
DomainGET /domain/{domain}
NameserverGET /nameserver/{nameserver}
IpGET /ip/{ip}
AsnGET /autnum/{asn}

Install in three steps

  1. Create a free account at 0n3.app and connect RDAP (domain lookup): paste a key or sign in through a door. It lands in your vault, encrypted.
  2. Open 0n3.app/install, pick your AI. A key is made for that AI alone; copy the line it gives you.
  3. Ask your AI: whoami. It answers with your connected services. Then ask it to list customers in RDAP (domain lookup).
Install (user scope — every project)
claude mcp add --transport http --scope user 0n3 https://0n3.app/mcp --header "Authorization: Bearer <your 0n token>"

Connect RDAP (domain lookup) to

Claude Code + RDAP (domain lookup)MCP server + skillClaude (desktop & claude.ai) + RDAP (domain lookup)connectorChatGPT + RDAP (domain lookup)connector · GPT actionCodex CLI + RDAP (domain lookup)MCP serverGemini CLI + RDAP (domain lookup)MCP serverCursor + RDAP (domain lookup)MCP serverVS Code (Copilot) + RDAP (domain lookup)MCP serverWindsurf + RDAP (domain lookup)MCP server

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Questions

What can an AI do with the RDAP (domain lookup) MCP server?

4 things: lookup, more. Every call runs with your own RDAP (domain lookup) connection and lands on a receipt.

Do I need to run anything on my computer?

No. 0n3 is hosted. Connect RDAP (domain lookup) once, install 0n3 into your AI with one line, done.

Where does my RDAP (domain lookup) key go?

Into your 0n3 vault, encrypted, one record per connection. The AI never sees it.