CTlogs.io
Claude connectorCommunityCertificate Transparency data for AI assistants: the certificates on record for any hostname or domain, with issuer, validity window and fi…
CTlogs.io gives Claude access to the public Certificate Transparency logs.
Data comes from the Certificate Transparency logs run by Google, Sectigo and DigiCert. New certificates are ingested continuously as they appear, so recently issued ones typically show up shortly after issuance, and lookups reach back to 2018.
Look up a hostname and get the certificates on record for it: the issuer, the certificate type, the validity window, and when each one was logged. Look up a domain to see the certificates logged across it, or start from a SHA-256 fingerprint to identify one certificate and the names it covers. Filter by issuer, by the date a certificate was logged, and by whether you want only currently valid certificates or expired ones as well.
Two supporting tools report the state of the service: one gives the size of the index and when it was last updated, the other gives the allowance left on your account for the current hour.
All three tools are read-only. Results come back as structured records, 25 rows by default and 100 at most, with a cursor for the next page.
CTlogs reproduces publicly available Certificate Transparency log data without modification. Those entries are produced by certificate authorities and log operators.
An account with an active plan is required. The free tier covers the website and the browser tools, but not the MCP connector.
- Tools
- 3
exposed by this connector
Movement
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In its categories
How this connector compares with others in the same category. Positions are counted within the category, not across the whole directory.
Data analytics2,917th of 3,156 by popularity · not ranked by trending score
| # | Connector | Popularity | Trending | 7d |
|---|---|---|---|---|
| 2915 |  Contrie | 1,585 | — | 1,350places down |
| 2916 | 1,585 | — | — | |
| 2917 | CTlogs.ioThis page | 1,585 | — | — |
| 2918 |  D Card | 1,585 | — | 1,026places down |
| 2919 | 1,585 | — | 1,026places down |
This connector isn’t ranked by trending score, so the category’s top connectors are shown instead.
| # | Connector | Trending | Popularity | 7d |
|---|---|---|---|---|
| 1 |  Adspirer Social Ads | 56,189,368 | 13,885 #82 | — |
| 2 | 40,560,351 | 13,117 #124 | 0 | |
| 3 | 543,530 | 8,880 #622 | 4places down | |
| 4 | 448,719 | 9,295 #533 | 3places up | |
| 5 | 446,435 | 7,687 #901 | 18places up |
Developer tools1,360th of 1,510 by popularity · not ranked by trending score
This connector isn’t ranked by trending score, so the category’s top connectors are shown instead.
| # | Connector | Trending | Popularity | 7d |
|---|---|---|---|---|
| 1 |  Framer | 34,697,858 | 14,421 #44 | 2places down |
| 2 | 445,667 | 8,165 #366 | — | |
| 3 |  Intuit Developer | 348,009 | 13,338 #62 | 18places down |
| 4 |  Claude Academy | 338,315 | 15,186 #25 | 93places up |
| 5 |  Exness | 214,302 | 8,290 #353 | — |
Install
claude mcp add --transport http ctlogs https://mcp.ctlogs.io/mcp
Tools
- account_quota
- index_status
- lookup_certificates
- Categories
- Made by
- Lyalpha GmbH · Website
- Sign-in
- Required
- Connector URL
- https://mcp.ctlogs.io/mcp
- Transport
- Streamable HTTP
- Permissions
- Reads public Certificate Transparency records, and the query allowance left on your CTlogs account for the current hour. It cannot change anything in your account, cannot write to the index, and has no access to anything else you hold at CTlogs.
- Works with
- Claude, Claude API, Claude Code, Claude Desktop
- Added
- September 22, 2026
- More info
- Sponsorship
- Promote this connector