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 analytics2,883rd of 3,282 by popularity · not ranked by trending score
| # | Connector | Popularity | Trending | 7d |
|---|---|---|---|---|
| 2881 | 2,000 | — | — | |
| 2882 | 2,000 | — | — | |
| 2883 | CTlogs.ioThis page | 2,000 | — | — |
| 2884 | 2,000 | — | 944places down | |
| 2885 | 2,000 | — | 944places down |
This connector isn’t ranked by trending score, so the category’s top connectors are shown instead.
| # | Connector | Trending | Popularity | 7d |
|---|---|---|---|---|
| 1 | 42,345,503 | 13,242 #116 | 0 | |
| 2 |  Adspirer Social Ads | 30,557,087 | 14,248 #67 | — |
| 3 |  Hevy | 1,955,298 | 8,690 #672 | — |
| 4 | 714,596 | 7,435 #995 | — | |
| 5 | 502,891 | 7,877 #877 | 10places up |
Developer tools1,346th of 1,608 by popularity · not ranked by trending score
| # | Connector | Popularity | Trending | 7d |
|---|---|---|---|---|
| 1344 | 2,000 | — | 1,205places down | |
| 1345 | 2,000 | — | — | |
| 1346 | CTlogs.ioThis page | 2,000 | — | — |
| 1347 | 2,000 | — | 944places down | |
| 1348 | 2,000 | — | — |
This connector isn’t ranked by trending score, so the category’s top connectors are shown instead.
| # | Connector | Trending | Popularity | 7d |
|---|---|---|---|---|
| 1 |  Framer | 34,158,649 | 14,826 #36 | 2places down |
| 2 |  Claude Academy | 465,374 | 15,594 #19 | 35places up |
| 3 |  LaTeX Compiler | 400,664 | 9,014 #294 | — |
| 4 |  Exness | 305,009 | 8,468 #345 | — |
| 5 |  Intuit Developer | 186,229 | 13,415 #63 | 50places down |
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
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