SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
lern-box.ch
SSL/TLS Certificate
SSL/TLS Certificate for lern-box.ch
Valid- Issued by (CA)
- Let's Encrypt
- Subject
- lern-box.ch
- Valid from
- Jul 21, 2026
- Valid until
- Oct 19, 2026 (70 days remaining)
- Public key
- RSA 2048-bit
- Serial
- 05EE79462AFBA64DC59A4F6494FAB9778CF4
- SHA-256 fingerprint
- 20:CB:8F:7A:F7:72:75:C7:9F:C6:64:E7:D6:79:11:B1:A4:A8:97:59:80:25:0F:AB:F0:C1:20:DE:CB:1C:1A:A6
- Chain
- YR1 → Root YR → ISRG Root X1
Certificate Authority Authorization (CAA)
No CAA policy is published for this domain — any certificate authority may issue for it.
Never get surprised by lern-box.ch's certificate expiring
This is today's certificate. Turn on monitoring and we'll watch lern-box.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, 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.