SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
gfk-systems.de
SSL/TLS Certificate
SSL/TLS Certificate for gfk-systems.de
Valid- Issued by (CA)
- Let's Encrypt
- Subject
- gfk-systems.de
- Valid from
- Jun 19, 2026
- Valid until
- Sep 17, 2026 (53 days remaining)
- Public key
- RSA 2048-bit
- Serial
- 05E873A4AFE6A76A0FC079375FF72C0346B9
- SHA-256 fingerprint
- 5C:B2:78:17:5F:D3:77:F7:B0:B8:AD:57:D3:B0:E8:28:F4:9D:56:74:C6:91:21:49:4A:0B:D0:8D:1B:E9:0A:01
- 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 gfk-systems.de's certificate expiring
This is today's certificate. Turn on monitoring and we'll watch gfk-systems.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.