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 optima-immobilier.fr

Valid
Issued by (CA)
Let's Encrypt
Subject
ftp.optima-immobilier.fr
Valid from
Sep 26, 2026
Valid until
Dec 25, 2026 (64 days remaining)
Public key
EC 384-bit
Serial
06D505502B03960497B6129D7D7EE67CD5AF
SHA-256 fingerprint
A9:FB:2D:5A:DF:BE:02:8F:63:F1:48:70:AE:A4:DE:A0:41:D9:06:17:52:A3:DA:47:A8:79:0C:E6:C4:AB:C9:63
Chain
YE1 → Root YE → ISRG Root X2 → ISRG Root X1
Subject Alternative Names (6)
ftp.optima-immobilier.fr, mail.optima-immobilier.fr, optima-immobilier.fr, pop.optima-immobilier.fr, smtp.optima-immobilier.fr, www.optima-immobilier.fr

Certificate Authority Authorization (CAA)

No CAA policy is published for this domain — any certificate authority may issue for it.

We've observed 1 previous certificate for this host. This certificate has been served since Oct 6, 2026.

Never get surprised by optima-immobilier.fr's certificate expiring

This is today's certificate. Turn on monitoring and we'll watch optima-immobilier.fr continuously, notifying you the moment anything moves across all three signals:

Certificate monitor showing the issuer, expiry date, chain status, fingerprint, covered names, and a history of a rotation and an expiry warning

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.

Monitor this certificate free

Free for your first domain: uptime, DNS, and certificate together. No credit card.