Domain Intelligence — Claude Code MCP server: WHOIS, DNS, SSL lookups
A hosted MCP server that lets an agent pull WHOIS, DNS, TLS certificates, live subdomains and email-security records for a domain. Starts without a key.
claude mcp add --transport http domain-intelligence https://oti-labs.com/mcpWhat Domain Intelligence does
Six read-only tools sit behind one HTTP endpoint. domain_lookup bundles everything, whois_lookup returns registrar plus registration and expiry dates, dns_records covers A, AAAA, MX, TXT, NS, CAA and SOA. ssl_certificate performs a real TLS handshake and reports the issuer, validity window and SANs; subdomains lists hosts that actually answer, with their IPs. email_security digs out SPF, DMARC and DKIM keys across a set of frequent selectors. Nothing here writes to the target.
Keyless access is metered per IP each month; connectors such as Claude or ChatGPT share a single pool per provider, and anonymous traffic also hits a daily ceiling that resets at 00:00 UTC. Past that, pass a RapidAPI key in the X-RapidAPI-Key header (or as a Bearer token) and calls bill against your RapidAPI plan. Without the header you get a quota refusal, not a hint.
domain_lookup trims long subdomain output via subdomain_limit, defaulting to 50 names. On the standalone subdomains tool, wait=true blocks until every source has replied — slower, but you see the whole set. Clients that only speak stdio, like Claude Desktop, go through mcp-remote launched by npx.
What it helps with
- find out who registered a domain and when it lapses
- capture current DNS records before a migration
- check how soon a TLS certificate expires
- enumerate answering subdomains and their IPs
- see whether SPF, DMARC and DKIM are in place
Example prompts for the agent
- Who is the registrar for
example.com, and when was it registered? - Check the TLS certificate on
example.com— issuer and days left. - Give me the live subdomains of the site you just looked up, with IPs.
How to install Domain Intelligence
Platform CLI: remote server
claude mcp add --transport http domain-intelligence https://oti-labs.com/mcpPlatform CLI: remote server
codex mcp add mcp --url https://oti-labs.com/mcpConfig file
{
"mcpServers": {
"mcp": {
"url": "https://oti-labs.com/mcp"
}
}
}Config file
{
"servers": {
"mcp": {
"type": "http",
"url": "https://oti-labs.com/mcp"
}
}
}Platform CLI: remote server
gemini mcp add -t http mcp https://oti-labs.com/mcpStep by step, with commands for each platform: How to add an MCP server to Claude Code, Codex, Cursor, VS Code, Gemini CLI and more
Questions about Domain Intelligence
How do I install Domain Intelligence in Claude Code?
Run claude mcp add --transport http domain-intelligence https://oti-labs.com/mcp. No key is required for the first calls.
What does Domain Intelligence do?
It answers domain questions for your agent: WHOIS and RDAP data, DNS records, the current certificate, subdomains with IPs, and SPF/DMARC/DKIM entries. Every tool is read-only.
What happens after the keyless quota runs out?
You supply a RapidAPI key in the X-RapidAPI-Key header, or send it as Authorization: Bearer <key>. Calls then count against your RapidAPI plan, whose free tier adds more allowance.
