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 essym.fr
Expired- Issued by (CA)
- TERENA
- Subject
- www.essym.fr
- Valid from
- Dec 21, 2019
- Valid until
- Jan 18, 2022 (expired 1692 days ago)
- Public key
- RSA 2048-bit
- Serial
- 05575DA75BC028BFAE0609C8532CE352
- SHA-256 fingerprint
- 55:BE:C2:3C:C2:E0:22:75:63:21:AE:7F:92:8D:DE:C5:C0:D8:F5:76:F5:94:39:C3:A2:68:9A:86:08:A6:EF:00
- Chain
- TERENA SSL CA 3 → DigiCert Assured ID Root CA
Certificate Authority Authorization (CAA)
No CAA policy is published for this domain — any certificate authority may issue for it.
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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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