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 sefag-components.at

Valid
Issued by (CA)
Let's Encrypt
Subject
sefag-ag.ch
Valid from
Sep 21, 2026
Valid until
Dec 20, 2026 (60 days remaining)
Public key
RSA 2048-bit
Serial
06C96EBFA8B4AC51BAFEF6EB1D8928B885BC
SHA-256 fingerprint
5F:52:84:F1:B5:3F:AE:31:DE:D0:C4:80:AE:5A:38:AA:F1:CB:86:04:CB:64:E6:EE:A8:F7:2F:72:04:56:5F:4B
Chain
YR1 → Root YR → ISRG Root X1
Subject Alternative Names (42)
*.sefag-ag.ch, sefag-ag.at, sefag-ag.ch, sefag-ag.com, sefag-ag.de, sefag-ag.eu, sefag-ag.fr, sefag-ag.it, sefag-components.at, sefag-components.ch, sefag-components.com, sefag-components.de, sefag-components.eu, sefag-components.fr, sefag-components.it, sefag.at, sefag.ch, sefag.de, sefag.eu, sefag.fr, sefag.it, sefag.org, www.sefag-ag.at, www.sefag-ag.com, www.sefag-ag.de, www.sefag-ag.eu, www.sefag-ag.fr, www.sefag-ag.it, www.sefag-components.at, www.sefag-components.ch, www.sefag-components.com, www.sefag-components.de, www.sefag-components.eu, www.sefag-components.fr, www.sefag-components.it, www.sefag.at, www.sefag.ch, www.sefag.de, www.sefag.eu, www.sefag.fr, www.sefag.it, www.sefag.org

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 Sep 26, 2026.

Never get surprised by sefag-components.at's certificate expiring

This is today's certificate. Turn on monitoring and we'll watch sefag-components.at 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.