Crt Sh MCP Server

by mrfentmen Your server? Claim it

local only

Crt Sh MCP runs on your own machine — the client starts it, so there is no endpoint to ping. 199 installs a week from npm. Last commit 8 Nov 2026.

crt.sh: certificate transparency search with issuer and expiry dates - keyless.

Installs per day peak 199 · avg 6

a month agotoday

199

Installs / week

npm · @mrfentmen/crt-sh-mcp

Stars

0 open issues

8 Nov 2026

Last commit

2 releases in 90 days

—

License

TypeScript

Nothing serious here today

Today is the operative word: we check Crt Sh MCP 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

This server runs on your own machine — install it with the package manager and the client starts it for you. Package name taken from the official registry entry.

Claude Code Claude Desktop Codex Cursor VS Code

run in your terminal

claude mcp add crt-sh-mcp -- npx -y @mrfentmen/crt-sh-mcp

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

{
  "mcpServers": {
    "crt-sh-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "@mrfentmen/crt-sh-mcp"
      ]
    }
  }
}

~/.codex/config.toml

[mcp_servers.crt-sh-mcp]
command = "npx"
args = ["-y", "@mrfentmen/crt-sh-mcp"]

.cursor/mcp.json

{
  "mcpServers": {
    "crt-sh-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "@mrfentmen/crt-sh-mcp"
      ]
    }
  }
}

.vscode/mcp.json

{
  "servers": {
    "crt-sh-mcp": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "@mrfentmen/crt-sh-mcp"
      ]
    }
  }
}

Alternatives to Crt Sh MCP

same job, measured the same way

Crtsh

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answering

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Inspect TLS certificates of a host: issuer, expiry, and SAN. No key required.

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crt.sh SSL Certificate Transparency & Subdomain Recon

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Query crt.sh SSL/TLS Certificate Transparency logs for subdomain discovery and certificate audits.

28 tools answering

Data Gouv Fr MCP

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data.gouv.fr: search French open datasets with producers and update dates - keyless.

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Subdomain Finder MCP

by theluckystrike

Passive subdomain enumeration from certificate transparency (certspotter, crt.sh) with DNS checks.

4 tools answering

Certspotter MCP

by mrfentmen

Certificate transparency lookups from Cert Spotter. No key required.

119 installs/wk local only

Crt Sh MCP — questions

Answers built from our own checks of this server.

Why is there no uptime for Crt Sh MCP?

Crt Sh MCP runs on your own machine over stdio — there is no network address to reach, so uptime cannot be measured for it by anyone. What can be measured is adoption: the npm package @mrfentmen/crt-sh-mcp was installed 199 times last week.

How do I connect Crt Sh MCP?

Copy the ready config from this page. We generate it for Claude Code, Claude Desktop, Codex, Cursor and VS Code, each in the form that client actually reads. It runs locally, so the command pulls @mrfentmen/crt-sh-mcp straight from npm; nothing to host, nothing to sign up for.

How many people use Crt Sh MCP?

The npm package @mrfentmen/crt-sh-mcp was installed 199 times in the last week. We show installs rather than GitHub stars on purpose: a star is a bookmark, an install is someone actually running it.

Is Crt Sh MCP open source?

We cannot say either way: written in TypeScript and 0 stars on GitHub, but we could not determine the licence, and without one the code is not open source by default.