SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
open-arktur.org
SSL/TLS Certificate
SSL/TLS Certificate for open-arktur.org
Hostname mismatch- Issued by (CA)
- Let's Encrypt
- Subject
- friedberg-hosting.de
- Valid from
- Oct 1, 2026
- Valid until
- Dec 30, 2026 (74 days remaining)
- Public key
- RSA 4096-bit
- Serial
- 060856B815D79F2844411D033A95ED0A127C
- SHA-256 fingerprint
- 21:51:CB:03:ED:C3:48:71:F8:B1:20:A0:34:FC:1A:AD:29:96:2A:D4:7A:DE:2C:7D:54:BB:0A:3D:F5:F4:BC:D1
- 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.
We've observed 1 previous certificate for this host. This certificate has been served since Oct 4, 2026.
Never get surprised by open-arktur.org's certificate expiring
This is today's certificate. Turn on monitoring and we'll watch open-arktur.org 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.