SSL/TLS Certificate Lookup

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

ec2-13-55-81-210.ap-southeast-2.compute.amazonaws.com

SSL/TLS Certificate

SSL/TLS Certificate for ec2-13-55-81-210.ap-southeast-2.compute.amazonaws.com

Hostname mismatch
Issued by (CA)
Amazon
Subject
ap.threatsim.com
Valid from
Nov 9, 2025
Valid until
Dec 8, 2026 (123 days remaining)
Public key
RSA 2048-bit
Serial
06FBBDEE7CD682D12B510B6744DEBD93
SHA-256 fingerprint
0D:AF:2D:34:5C:14:5A:60:03:36:3E:AA:14:C2:AC:4F:56:59:2B:EA:5E:63:46:AD:9B:53:3C:57:02:49:80:3A
Chain
Amazon RSA 2048 M01 → Amazon Root CA 1 → Starfield Services Root Certificate Authority - G2
Subject Alternative Names (10)
*.ap.securityeducation.com, *.ap.threatsim.com, *.proofpoint-simulations.io, *.securityeducation.com, ap.securityeducation.com, ap.threatsim.com, phishsim-ap.securityeducation.com, phishsim.ws03-securityeducation.com, proofpoint-simulations.io, securityeducation.com

Certificate Authority Authorization (CAA)

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

Never get surprised by ec2-13-55-81-210.ap-southeast-2.compute.amazonaws.com's certificate expiring

This is today's certificate. Turn on monitoring and we'll watch ec2-13-55-81-210.ap-southeast-2.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.