SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
koenig-rex.com
SSL/TLS Certificate
SSL/TLS Certificate for koenig-rex.com
Valid- Issued by (CA)
- Let's Encrypt
- Subject
- koenig-rex.com
- Valid from
- Aug 10, 2026
- Valid until
- Nov 8, 2026 (42 days remaining)
- Public key
- EC 256-bit
- Serial
- 054094D28805CB643109BEEAEC9F2BC41D32
- SHA-256 fingerprint
- 4B:4B:F2:B4:52:02:94:17:1B:70:8A:36:4B:55:22:9E:AB:0E:72:9A:17:F4:F3:1E:94:D2:25:07:07:74:94:3C
- Chain
- YE1 → Root YE → ISRG Root X2 → ISRG Root X1
Certificate Authority Authorization (CAA)
No CAA policy is published for this domain — any certificate authority may issue for it.
This certificate has been served since Sep 25, 2026.
Never get surprised by koenig-rex.com's certificate expiring
This is today's certificate. Turn on monitoring and we'll watch koenig-rex.com 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.