SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
SSL/TLS Certificate for cit-o.fr
Valid- Issued by (CA)
- Let's Encrypt
- Subject
- cit-o.fr
- Valid from
- Oct 4, 2026
- Valid until
- Jan 2, 2027 (89 days remaining)
- Public key
- EC 256-bit
- Serial
- 062FF2B50A564E0659B8C8AD1C911A313382
- SHA-256 fingerprint
- 7F:59:0F:23:67:E1:BC:05:C2:DF:2E:C8:43:3A:10:48:18:B5:D5:AF:E8:F5:EC:A8:F0:EF:9B:A8:CE:A3:66:49
- Chain
- YE2 → Root YE → ISRG Root X2 → ISRG Root X1
Certificate Authority Authorization (CAA)
No CAA policy is published for this domain — any certificate authority may issue for it.
This certificate has been served since Sep 25, 2026.
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This is today's certificate. Turn on monitoring and we'll watch cit-o.fr 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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