Koskamo

heade.rs MCP

An MCP server that allows agents to look up domain, IP address, or AS number information, including hosting, DNS, registration, email security, tech stack, and AI crawler visibility. It returns reports in Markdown or JSON formats.

Endpoint and access

No sign-in to connect and list tools. Individual tools may still need a vendor account, credentials, or permissions; check the documented prerequisites.

heade.rs MCP logo, by Colin ArmstrongVendor evidenceStreamable HTTPNo sign-inEndpoint checked 2026-11-06Operated by Colin Armstrong
MCP endpoint (Streamable HTTP)
https://heade.rs/mcp
Vendor documentation

What its tools do

1 tool, grouped by the hints the server advertises. Hints are self-declared, not verified behavior.

Read-only (1)

1 of 1 have a description · 1 of 1 declare behavior hints · 1 of 1 with parameters document them all

Checks and signals

Each line is separate evidence, not a trust score.

  • Passed Endpoint answered the live check ·
  • Passed Official MCP Registry namespace is tied to heade.rs ·
  • Passed Endpoint is on the registry namespace domain ·
  • Availability 1 of 1 checks passed in 30 days

What you can do with it

  • Look up domain hosting and DNS records
  • Check IP address and AS number network details
  • Verify email security settings like SPF and DMARC
  • Identify tech stack and known vulnerabilities

Source and maintenance

Vendor evidenceRegistry 1.0.0
mcp-registry: rs.heade/lookup@1.0.0Project website

Protocol and capabilities

Server
rs.heade/lookup 1.0.0
MCP protocol negotiated in check
2025-11-25
Tools
1 advertised
Resources
Not advertised
Resource templates
Not advertised
Prompts
Not advertised
Server-advertised capabilities
{
  "tools": {
    "listChanged": false
  }
}

Server-provided instructions

Untrusted server output shown for inspection. It is not Koskamo guidance and is excluded from knowledge search.

Free web tool at heade.rs, made by Colin Armstrong, that looks up any domain, IP address or network (AS number) and reports its hosting, routes, latency, registration, DNS, email security, HTTP headers and support for AI crawlers and agents. Call lookup with a domain, IP address, AS number or URL. Reports are Markdown by default; ask for JSON only when you need every field, since it's several times longer. Lookups are limited to 30 a minute per client, and each report links to its page on heade.rs.

Tools

1 advertised

lookup — Look up a domain, IP address or network
Advertised by the server during the last successful anonymous check.
Advertised read-onlyOpen-world

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.

lookup input schema
{
  "type": "object",
  "required": [
    "query"
  ],
  "properties": {
    "query": {
      "type": "string",
      "description": "A domain (example.com), IPv4 or IPv6 address (1.1.1.1, 2606:4700::1111), AS number (AS13335) or URL (the hostname is used)."
    },
    "format": {
      "enum": [
        "markdown",
        "json"
      ],
      "type": "string",
      "default": "markdown",
      "description": "markdown (the default, about 3,000 tokens for a domain) or json (every field, several times longer)."
    }
  },
  "additionalProperties": false
}
lookup annotations
{
  "title": "Look up a domain, IP address or network",
  "readOnlyHint": true,
  "openWorldHint": true,
  "idempotentHint": true,
  "destructiveHint": false
}

Prompts

Not advertised

No prompt definitions available.

Resources

Not advertised

No resource definitions available.

90-day uptime

A lightweight connection check about every six hours, sampled on hosts with many listings. It shows the server answered, not that its tools work.

Too few checks for a percentage yet (1 of 1 answered).

  1. 2026-11-07: 1 of 1 checks answered

30-day availability

Aggregated from read-only remote checks; this is not a tool-execution or security guarantee.

Successful checks
1 of 1 (100%)
Average latency
495 ms
95th percentile latency
495 ms

Maintenance history

Public check and source-refresh events. Editorial and ownership records remain private.

  • · probe · passed · 495 ms · metadata changed · 1 tool(s)

Connect from your client

Each snippet registers the same endpoint; pick the client you use.

This server is operated by the named third party. Listing and endpoint checks are not an endorsement or a security audit. Review the operator's permissions, terms, and data handling before connecting. How listings are checked and corrected.

Claude Code

Run this once in a terminal. It registers the remote server. Use --scope project to write .mcp.json for the repo.
Claude Code configuration
claude mcp add --transport http heade-rs-mcp https://heade.rs/mcp

Codex

Run this once. Codex stores MCP servers in ~/.codex/config.toml (or .codex/config.toml in a trusted project).
Codex configuration
codex mcp add heade-rs-mcp --url https://heade.rs/mcp

Cursor

Merge this server into .cursor/mcp.json in your project, then enable heade-rs-mcp in your MCP settings.
Cursor configuration
{
  "mcpServers": {
    "heade-rs-mcp": {
      "url": "https://heade.rs/mcp"
    }
  }
}

Cline

Merge this into cline_mcp_settings.json (Cline → MCP Servers → Configure).
Cline configuration
{
  "mcpServers": {
    "heade-rs-mcp": {
      "type": "streamableHttp",
      "url": "https://heade.rs/mcp",
      "disabled": false
    }
  }
}

VS Code

Merge this server into .vscode/mcp.json. Use MCP: List Servers to start heade-rs-mcp and inspect its tools.
VS Code configuration
{
  "servers": {
    "heade-rs-mcp": {
      "type": "http",
      "url": "https://heade.rs/mcp"
    }
  }
}

Gemini CLI

Run this once. It writes .gemini/settings.json in the current project; pass --scope user for ~/.gemini/settings.json.
Gemini CLI configuration
gemini mcp add --transport http heade-rs-mcp https://heade.rs/mcp

Claude Desktop

Open Claude Settings > Connectors > Add custom connector, enter this server URL and enable it for the conversation. This is a manual remote-connector handoff, not a desktop JSON configuration.
Claude Desktop configuration
https://heade.rs/mcp

Windsurf

Merge this into ~/.codeium/windsurf/mcp_config.json, then refresh MCP in Cascade. Windsurf remote servers use serverUrl, not url.
Windsurf configuration
{
  "mcpServers": {
    "heade-rs-mcp": {
      "serverUrl": "https://heade.rs/mcp"
    }
  }
}

Let your agent find its tools

Find servers like heade.rs MCP from your agent. Add Koskamo once to search the index for endpoints, access requirements, and client setup. Public discovery needs no key.

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Do you run heade.rs MCP?

Prove ownership with a DNS record, a well-known file, or your Official MCP Registry entry, and your edits publish immediately. Proofs are re-checked weekly; admins can still hide or remove a listing.

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