SSL/TLS Certificate Lookup

Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted

ec2-46-51-146-248.eu-west-1.compute.amazonaws.com

SSL/TLS Certificate

SSL/TLS Certificate for ec2-46-51-146-248.eu-west-1.compute.amazonaws.com

Hostname mismatch
Issued by (CA)
Amazon
Subject
knowbe4.com
Valid from
Feb 14, 2026
Valid until
Mar 14, 2027 (208 days remaining)
Public key
RSA 2048-bit
Serial
0D2548595A3D29AA7A1C4C236E93A166
SHA-256 fingerprint
04:AB:B0:2C:09:BF:46:DC:D5:8B:48:B6:85:9B:50:E8:B6:7B:47:34:44:EE:73:1F:A7:75:07:18:9E:0C:22:B3
Chain
Amazon RSA 2048 M04 → Amazon Root CA 1 → Starfield Services Root Certificate Authority - G2
Subject Alternative Names (2)
*.knowbe4.com, knowbe4.com

Certificate Authority Authorization (CAA)

No CAA policy is published for this domain — any certificate authority may issue for it.

Never get surprised by ec2-46-51-146-248.eu-west-1.compute.amazonaws.com's certificate expiring

This is today's certificate. Turn on monitoring and we'll watch ec2-46-51-146-248.eu-west-1.compute.amazonaws.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.

Monitor this certificate free

Free for your first domain: uptime, DNS, and certificate together. No credit card.