SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
on-server.de
SSL/TLS Certificate
SSL/TLS Certificate for on-server.de
Valid- Issued by (CA)
- Let's Encrypt
- Subject
- on-server.de
- Valid from
- Jun 25, 2026
- Valid until
- Sep 23, 2026 (49 days remaining)
- Public key
- RSA 2048-bit
- Serial
- 05DBAA214A055E8A90C3E44BB21BA4B9101A
- SHA-256 fingerprint
- FF:A3:DE:EF:EE:90:77:8E:AB:78:5F:7A:20:99:1A:C5:F1:70:73:A3:89:08:85:95:79:9A:E5:FA:2E:C2:01:F1
- Chain
- YR2 → 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 on-server.de's certificate expiring
This is today's certificate. Turn on monitoring and we'll watch on-server.de 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.