SSL Monitor

MCP npm version License: MIT Node.js

Languages: English | 中文 | 日本語

A Model Context Protocol (MCP) server that provides domain registration information and SSL certificate monitoring capabilities. Perfect for security monitoring, domain management, and certificate lifecycle tracking.

🚀 Quick Start

HTTP (Remote MCP server)

• Name: sslmon
• URL: https://sslmon.dev/mcp

# Claude Code
claude mcp add -t http sslmon https://sslmon.dev/mcp
# Gemini CLI
gemini mcp add -t http sslmon https://sslmon.dev/mcp
# Qwen Code
qwen mcp add -t http sslmon https://sslmon.dev/mcp
# Codex
codex mcp add sslmon --url https://sslmon.dev/mcp

NPX (Local MCP server)

Mac/Linux:

# Add to Claude Desktop
claude mcp add sslmon -- npx -y sslmon-mcp

Windows:

# Add to Claude Desktop
claude mcp add sslmon -- cmd /c npx -y sslmon-mcp

Configuration (Local MCP server)

{
  "mcpServers": {
    "sslmon": {
      "command": "npx",
      "args": ["-y", "sslmon-mcp"],
      "env": {}
    }
  }
}

[mcp_servers.sslmon]
command = "npx"
args = ["-y", "sslmon-mcp"]

✨ Features

• 🔍 Domain Registration Info - Get domain registration and expiration dates
• 🔒 SSL Certificate Info - Check SSL certificate validity periods and details

🛠️ Available Tools

get_domain_info

Get domain registration and expiration information.

Parameters:

• domain (string, required): The top-level domain to check (e.g., "example.com")

Returns: JSON object with:

• domain: The queried domain
• registrationDate: Domain registration date
• expirationDate: Domain expiration date
• registrar: Domain registrar name
• registrant: Domain registrant information (when available)
• status: Domain status
• daysUntilExpiry: Number of days until domain expires

get_ssl_cert_info

Get SSL certificate information and validity status for any domain.

Parameters:

• domain (string, required): The domain to check SSL certificate for
• port (number, optional): Port number to check (default: 443)

Returns: JSON object with:

• domain: The queried domain
• validFrom: Certificate valid from date (ISO string)
• validTo: Certificate valid to date (ISO string)
• issuer: Certificate issuer
• subject: Certificate subject
• isValid: Boolean indicating if certificate is currently valid
• daysUntilExpiry: Number of days until certificate expires

Related Projects

• sslmon-cli — Standalone CLI binary (Go) for domain WHOIS and SSL certificate queries, ideal for shell scripts and CI/CD pipelines.