heade.rs MCP Server

by heade Your server? Claim it

answering

heade.rs is answering right now. Last checked 1 min ago. It exposes 1 tools.

Look up any domain, IP address or AS number: hosting, DNS, registration, email, TLS and headers.

Uptime history 18 days of history

18 days agonow

100.0%

Uptime 24h

92 of 92 checks

Tools

read from the server

205 ms

Response time

average over 24h

open, no key

Access

streamable-http

Nothing serious here today

Today is the operative word: we check heade.rs every 15 minutes and re-read its code on every release. Watch it and you find out the day that stops being true.

Connect this server

Endpoint below is the one we actually reach during checks — not the one copied from a README. Last verified 1 min ago.

Claude Code Claude Desktop Codex Cursor VS Code

run in your terminal

claude mcp add lookup --transport http https://heade.rs/mcp

~/Library/Application Support/Claude/claude_desktop_config.json

{
  "mcpServers": {
    "lookup": {
      "url": "https://heade.rs/mcp"
    }
  }
}

~/.codex/config.toml

[mcp_servers.lookup]
url = "https://heade.rs/mcp"

.cursor/mcp.json

{
  "mcpServers": {
    "lookup": {
      "url": "https://heade.rs/mcp"
    }
  }
}

.vscode/mcp.json

{
  "mcpServers": {
    "lookup": {
      "url": "https://heade.rs/mcp"
    }
  }
}

Available tools 1

Read directly from the server with tools/list, grouped by what they act on. If a tool disappears, we record the date.

lookup

lookup

Look up a domain, IP address or network (AS number) on heade.rs and return its report. For a domain or IP address: where it's hosted (network, BGP prefix, RPKI, location, cloud region, CDN), registration (RDAP/WHOIS), DNS records and DNSSEC, email security (SPF, DMARC, MTA-STS, BIMI), the certificate, a security-header grade and the response headers, the website's tech stack with end-of-life and vulnerability checks, which AI crawlers it lets in and what it offers agents, and open ports from Shodan InternetDB. For an AS number: its prefixes, RPKI and ASPA, upstreams and peers, internet exchanges and registration. Data is live or mirrored within the hour; a lookup takes a few seconds.

Endpoints

URL	Transport	State	Latency	Checked
https://heade.rs/mcp	streamable-http	answering	241 ms	1 min ago

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heade.rs — questions

Answers built from our own checks of this server.

What can heade.rs do?

It exposes 1 tools, read directly from the server on our last check. Among them: lookup. The full list with descriptions is on this page — we take it from the server itself via tools/list, not from a README. How MCP servers expose tools in the first place →

Is heade.rs working right now?

We send a real MCP handshake every 15 minutes. Over the last 24 hours 92 of 92 checks got a reply (100.0%), average response time 205 ms. The bar chart above shows every period we have measured.

How do I connect heade.rs?

Copy the ready config from this page — we generate it for Claude Code, Claude Desktop, Codex, Cursor and VS Code, each with the file path that client actually reads. It is a remote server, so there is nothing to install — the client connects to the address.

Does heade.rs need an API key?

No. heade.rs completed a full MCP handshake with us as an anonymous client and listed its tools without asking for anything. All 1 of them are readable on this page. This is what we observed, not what the docs claim.

How fast is heade.rs?

It answers our handshake in 205 ms on average, which is faster than 61% of all working MCP servers we measure. The comparison comes from our own checks across the whole registry, every 15 minutes.