@ctlogs.dev
Basic information
Transport
Streamable HTTP
Authentication
OAuth
Last updated
Category
Search
Author
ctlogs.dev
Submitted by
Anton
Search Certificate Transparency logs: find a domain's subdomains, its TLS certificates, and certificates issued to an organization.
https://mcp.ctlogs.dev/mcpclaude mcp add ctlogs --transport http https://mcp.ctlogs.dev/mcpList the hostnames found under a domain in TLS certificates: one row per hostname with the number of certificates and first/last seen dates. Covers certificates valid now or expired within the last 90 days; set history to true for every hostname certified since 2013 (needs an API key on the Pro Lite or Pro plan). Use this to enumerate subdomains; use search_certificates for the certificates themselves.
Return one issuing CA certificate by its SHA-256 fingerprint (the issuer_ca field of get_certificate): subject, issuer, validity, parent and cross-signed certificates, the number of certificates it issued and a page of them.
Return the full record of one certificate: subject, issuer, serial number, validity, DNS names, key and signature details, the CT log entries that recorded it and download URLs for the certificate body. id is the id field of a search result or the certificate's SHA-256 fingerprint (64 hex characters).
List TLS certificates issued for a domain name: id, matching names, issuer, serial number and validity dates. By default matches the exact name; set include_subdomains to true to also match every name under it. Covers certificates valid now or expired within the last 90 days unless archive is set to "full" or a year from 2013 (needs an API key on the Pro plan). Pass a row's id to get_certificate for the full record. To list hostnames rather than certificates, use find_subdomains.
List TLS certificates whose subject organization matches a name, e.g. "PayPal, Inc.": id, subject common name, domains, issuer and validity dates. Covers certificates valid now or expired within the last 90 days unless archive is set to "full" or a year from 2013 (needs an API key on the Pro plan). One call counts as 10 requests against the rate limit.
ctlogs.dev searches the public Certificate Transparency logs, where every publicly trusted TLS certificate is recorded. Connected to it, an assistant can answer questions such as "which subdomains does example.com have", "who issued the certificates for this name" or "which domains does this company hold certificates for".
It is a remote server: there is nothing to install, and it works at once without a key or an account.
All tools are read-only. Results cover certificates that are valid now or expired within the last 90 days.
Add the server by URL: https://mcp.ctlogs.dev/mcp (Streamable HTTP).
Claude Code:
claude mcp add --transport http ctlogs https://mcp.ctlogs.dev/mcp
Setup for Claude, ChatGPT, Cursor and VS Code: https://ctlogs.dev/mcp
The server works without an account up to the anonymous limits. Past them an assistant that supports sign-in asks you to sign in with GitHub, Google or an e-mail link; a new account gets a free API key with 10,000 credits a month for testing and non-commercial use. Clients where you set request headers yourself can send a key instead.
The ctlogs.dev - Certificate Transparency Search remote MCP server is a hosted Model Context Protocol endpoint at https://mcp.ctlogs.dev/mcp, so AI assistants can connect to it without installing or running anything locally.
Add the endpoint https://mcp.ctlogs.dev/mcp to any MCP-compatible client such as Claude Code, Cursor, or VS Code. The setup snippets on this page configure each client in one step.
Yes. ctlogs.dev - Certificate Transparency Search uses OAuth: the first time you connect, your MCP client opens a browser window to sign in and authorize access, then reuses the credentials for future sessions.
ctlogs.dev - Certificate Transparency Search exposes a Streamable HTTP endpoint, the transport used by remote MCP servers and supported by all major MCP clients.
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