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 ocso.fr
Valid- Issued by (CA)
- Gandi SAS
- Subject
- *.ocso.fr
- Valid from
- Jun 26, 2026
- Valid until
- Jan 10, 2027 (149 days remaining)
- Public key
- RSA 4096-bit
- Serial
- 07FDF263E78CE49A99E5B6F74542887F
- SHA-256 fingerprint
- 91:34:AE:59:8A:A9:67:FD:01:A3:22:B6:D4:A8:64:E1:F2:2F:B8:52:E4:09:97:C0:3A:D2:2A:FC:8D:3F:8D:13
- Chain
- GandiCert → DigiCert Global Root G2
Certificate Authority Authorization (CAA)
CAA restricts issuance to digicert.com, letsencrypt.org, sectigo.com; we couldn't map the serving CA (Gandi SAS) to one of these identifiers.
Never get surprised by ocso.fr's certificate expiring
This is today's certificate. Turn on monitoring and we'll watch ocso.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.
Free for your first domain: uptime, DNS, and certificate together. No credit card.