SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
1-jour.fr
SSL/TLS Certificate
SSL/TLS Certificate for 1-jour.fr
Valid- Issued by (CA)
- Sectigo Limited
- Subject
- *.1-jour.fr
- Valid from
- Jul 31, 2026
- Valid until
- Feb 10, 2027 (111 days remaining)
- Public key
- RSA 2048-bit
- Serial
- B3E400F85B3F83016B89DB5A5FF8AE60
- SHA-256 fingerprint
- 85:19:FF:1F:6A:F7:A4:A0:D4:3A:E4:6C:B0:AF:5F:25:AF:7A:8C:61:4A:C4:C1:51:F6:99:E7:F2:00:93:C2:BF
- Chain
- Sectigo Public Server Authentication CA DV R36 → Sectigo Public Server Authentication Root R46 → USERTrust RSA Certification Authority
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 Aug 11, 2026.
Never get surprised by 1-jour.fr's certificate expiring
This is today's certificate. Turn on monitoring and we'll watch 1-jour.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, CNAME, TXT 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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