CertIndex MCP
The only certificate-transparency MCP server. Search 2.15B+ TLS certificates, monitor domains for new issuance, stream the global CT firehose to your agent.
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Overview
An MCP (Model Context Protocol) server that exposes CertIndex's Certificate Transparency search tools to any MCP-compatible client (Claude Desktop, the MCP Inspector, Continue, etc.). CertIndex indexes the full public CT corpus (~5 M certificates, growing ~100 k/day). This server wraps the public CertIndex REST API so an LLM can ask questions like: - "List every TLS certificate ever issued for example.com." - "What subdomains has Let's Encrypt seen for mycompany.io?" - "Show me certs expiring in the next 30 days for api.mycompany.io." - "Pull the full PEM and CT log metadata for SHA-256 <fingerprint>."
Installation
pip install certindex-mcp
Configuration
{
"mcpServers": {
"certindex": {
"command": "uvx",
"args": ["certindex-mcp"],
"env": {
"CERTINDEX_API_KEY": "ctx_live_..."
}
}Capabilities
- Search certificates by domain or issuer
Find TLS certificates matching a domain, CN, issuer, or SAN pattern using `search_certificates`.
- Retrieve a certificate by fingerprint
Fetch full PEM data and CT log metadata for a specific SHA-256 fingerprint with `get_certificate`.
- List all certificates for a domain
Get every certificate ever issued for an exact domain via `get_domain_certificates`, optionally filtered to currently valid certs only.
- Enumerate subdomains seen in CT logs
Discover unique subdomains observed for a domain using cursor-based pagination in `get_subdomains`.
- Find certificates expiring soon
Identify certificates for a domain that expire within a given number of days using `get_expiring_certs`.
- Run a global index sweep
Submit an async substring search across the entire CT corpus by CN or SAN with `submit_global_sweep`, then poll results with `get_sweep_results`.
Tags
- security
- monitoring
- web-research
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