SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
3k-informatik.ch
SSL/TLS Certificate
SSL/TLS Certificate for 3k-informatik.ch
Valid- Issued by (CA)
- Let's Encrypt
- Subject
- www.3k-informatik.ch
- Valid from
- Oct 4, 2026
- Valid until
- Jan 2, 2027 (55 days remaining)
- Public key
- EC 256-bit
- Serial
- 069E12FA4E4A947570F02A76962478303492
- SHA-256 fingerprint
- 84:C4:8E:60:C5:76:F4:41:D9:44:57:4D:5B:69:C2:99:8C:3D:D1:AF:92:18:43:93:BC:89:D2:27:53:8F:EA:88
- Chain
- YE2 → Root YE → ISRG Root X2 → ISRG Root X1
Certificate Authority Authorization (CAA)
The serving CA (Let's Encrypt) is authorized by this domain's CAA records (letsencrypt.org).
Never get surprised by 3k-informatik.ch's certificate expiring
This is today's certificate. Turn on monitoring and we'll watch 3k-informatik.ch 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, 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.
Free for your first domain: uptime, DNS, and certificate together. No credit card.