SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
gemba.com
SSL/TLS Certificate
SSL/TLS Certificate for gemba.com
Expired- Issued by (CA)
- Let's Encrypt
- Subject
- *.kaizen.com
- Valid from
- Feb 4, 2026
- Valid until
- May 5, 2026 (expired 79 days ago)
- Public key
- RSA 2048-bit
- Serial
- 05DB8E8E5D82742E4202C61C3FBC6662F521
- SHA-256 fingerprint
- 88:36:65:30:46:4D:00:54:AC:83:8D:D2:B0:E3:1F:0D:89:04:67:4B:18:13:32:66:CA:3A:FD:7B:5D:37:E9:68
- Chain
- R12 → ISRG Root X1
Certificate Authority Authorization (CAA)
No CAA policy is published for this domain — any certificate authority may issue for it.
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This is today's certificate. Turn on monitoring and we'll watch gemba.com continuously, notifying you the moment anything moves across all three signals:
Uptime
We visit the site from multiple regions worldwide and email you within minutes if it goes down, with a per-region breakdown so a real outage stands out from a regional blip.
DNS changes
We watch NS, MX, CAA, DNSSEC, CNAME and A/AAAA records, and identify the host, network, and ASN behind them, so a real migration or hijack stands out from routine noise.
TLS certificate
We warn you 30, 14, 7, and 1 days before it expires, and flag it if the issuing authority changes or the certificate is unexpectedly replaced.
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