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MCP servers · RDAP (domain lookup) · connector · GPT action

Connect ChatGPT to RDAP (domain lookup)

One line gives ChatGPT your RDAP (domain lookup) account as tools: 4 endpoints, lookup, more, called with your own connection. No key in the prompt, a receipt for every call, revoke ChatGPT's access alone any time.

Get the line for ChatGPTConnect RDAP (domain lookup) first

Three steps

  1. Create a free 0n3 account and connect RDAP (domain lookup). Paste a key or sign in; it lands in your vault, encrypted.
  2. Install 0n3 into ChatGPT. A custom connector in Developer mode, or an Action on a custom GPT from the OpenAPI spec.
  3. Ask ChatGPT: whoami. Then: "List customers in RDAP (domain lookup)".
Custom connector (needs Developer mode)
  1. Settings → Connectors (or Apps) → Advanced → Developer mode on
  2. Create → name 0n3 · MCP server URL https://0n3.app/mcp · Authentication: OAuth
  3. Finish the sign-in with your 0n account
  4. Enable the connector in a chat and ask: "whoami"

ChatGPT connectors cannot send a static header, so 0n3 signs you in through its OAuth door (dynamic client registration is on).

The line above carries a placeholder; 0n3.app/install mints a real key named for ChatGPT and fills it in.

What ChatGPT can then do in 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}

RDAP (domain lookup) in other AI clients

Claude Code + RDAP (domain lookup)MCP server + skillClaude (desktop & claude.ai) + RDAP (domain lookup)connectorCodex 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

ChatGPT with other apps

Hostinger363 endpointsTelegram132 endpointsPipedrive95 endpointsResend67 endpointsSquare57 endpointsLinkedIn50 endpointsSlack45 endpointsFigma32 endpointsCloudConvert32 endpointseBay25 endpointsCRM24 endpointsQuickBooks21 endpoints