This server provides domain registration information and SSL certificate monitoring capabilities.
• Get domain registration details: Retrieve registration date, expiration date, registrar name, registrant information (when available), and domain status using WHOIS lookup. • Monitor SSL certificates: Obtain certificate validity periods (valid from/to dates), issuer, subject, current validity status, and days until expiry for any domain, with optional port specification (defaults to 443).
Click on "Deploy Server".
Wait a few minutes for the server to deploy. Once ready, it will show a "Started" state.
In the chat, type @ followed by the MCP server name and your instructions, e.g., "@SSL Monitor MCP Server check SSL certificate for google.com"
That's it! The server will respond to your query, and you can continue using it as needed.
Here is a step-by-step guide with screenshots.
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.
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/mcpMac/Linux:
# Add to Claude Desktop
claude mcp add sslmon -- npx -y sslmon-mcpWindows:
# Add to Claude Desktop
claude mcp add sslmon -- cmd /c npx -y sslmon-mcp{
"mcpServers": {
"sslmon": {
"command": "npx",
"args": ["-y", "sslmon-mcp"],
"env": {}
}
}
}[mcp_servers.sslmon]
command = "npx"
args = ["-y", "sslmon-mcp"]Related MCP server: nslookup.io MCP Server
🔍 Domain Registration Info - Get domain registration and expiration dates
🔒 SSL Certificate Info - Check SSL certificate validity periods and details
get_domain_infoGet 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_infoGet 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
sslmon-cli — Standalone CLI binary (Go) for domain WHOIS and SSL certificate queries, ideal for shell scripts and CI/CD pipelines.
Get domain registration, expiration, and daysUntilExpiry using WHOIS/RDAP.
Inputs: domain (required).
Get SSL certificate information for a host and port.
Inputs: domain (required), port.
Recent tool additions, removals, and schema changes observed during successful MCP inspections.
Loading tool schema changelog…
Scored across 2 tools
The two tools have clearly distinct purposes: one retrieves domain registration and expiration details via WHOIS/RDAP, while the other focuses on SSL certificate information for a host and port. There is no overlap in functionality, making it easy for an agent to select the appropriate tool based on the task.
Both tools follow a consistent verb_noun pattern with 'get_' as the prefix, followed by a descriptive noun phrase (domain_info, ssl_cert_info). This uniformity makes the tool set predictable and easy to understand.
With only two tools, the server feels thin for a monitoring purpose, as it lacks operations like checking SSL expiration alerts, updating or deleting monitored domains, or listing multiple domains. A more comprehensive monitoring server would typically include more tools to cover core workflows.
The tool set is severely incomplete for an SSL monitoring domain. It only provides read-only information (get_domain_info and get_ssl_cert_info) without any management capabilities such as adding domains to monitor, setting up alerts, or handling SSL renewal processes. This leaves significant gaps that could cause agent failures in automated monitoring tasks.
Monitor SSL certs (incl. origin behind Cloudflare), domain expiry, DNS, email auth and blacklists.
DNS monitoring and domain security: live DNS, propagation, WHOIS/RDAP, SSL and look-alike domains.
Track domain expiry, DNS, SSL and email security across registrars, and explain what changed.
WHOIS/RDAP, DNS, SSL, live subdomains with IPs, and SPF/DMARC/DKIM for any domain.