SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
guenard-sebastien.fr
SSL/TLS Certificate
SSL/TLS Certificate for guenard-sebastien.fr
Valid- Issued by (CA)
- Let's Encrypt
- Subject
- guenard-sebastien.fr
- Valid from
- Jun 21, 2026
- Valid until
- Sep 19, 2026 (47 days remaining)
- Public key
- RSA 2048-bit
- Serial
- 0580931689E0FECD0B557489F341CF37044E
- SHA-256 fingerprint
- E3:75:73:0A:76:1B:4B:6E:86:E3:01:2A:BA:AD:61:64:B7:89:7F:70:9F:E4:A7:22:E1:F8:A0:C0:F6:03:BA:72
- Chain
- YR1 → Root YR → 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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Uptime
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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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