SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
sef-idf.fr
SSL/TLS Certificate
SSL/TLS Certificate for sef-idf.fr
Valid- Issued by (CA)
- Let's Encrypt
- Subject
- sef-idf.fr
- Valid from
- Jun 21, 2026
- Valid until
- Sep 19, 2026 (58 days remaining)
- Public key
- EC 256-bit
- Serial
- 0587960C5FC03204C3B79711F6397E32E632
- SHA-256 fingerprint
- 83:74:84:D4:7F:6B:8D:44:FB:B2:44:0F:56:B8:22:02:E9:B0:2B:DA:E5:01:06:44:60:B3:6F:45:5B:E6:E1:ED
- 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.
Never get surprised by sef-idf.fr's certificate expiring
This is today's certificate. Turn on monitoring and we'll watch sef-idf.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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