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Check CertSpotter monitors new Certificate Transparency issuances for one or more domains and all their subdomains using SSLMate’s Cert Spotter API. It stores an opaque cursor per domain, suppresses alerts while building the initial baseline, and returns WARNING for later issuances with the issuing CA, DNS names and validity dates. State updates are atomic and overlapping executions are locked. The plugin uses only the Python standard library.
Current Version
1.0.0
Last Release Date
2026-09-05
Owner
SJC
Website
https://github.com/sjcjonker/check-certspotter
Download URL
https://raw.githubusercontent.com/sjcjonker/check-certspotter/b77ebe9c79e25bd56c040a9eea38e9012d446ef1/check_certspotter.py
License
GPL
Compatible With
Requires Linux or another system with fcntl.flock, Python 3.9 or newer, a Cert Spotter Certificate Search API token, and HTTPS access to api.certspotter.com. The first run creates a baseline and intentionally does not alert on historical certificates. Licensed GPL-3.0-or-later.
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