SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
ec2-16-144-129-100.us-west-2.compute.amazonaws.com
SSL/TLS Certificate
SSL/TLS Certificate for ec2-16-144-129-100.us-west-2.compute.amazonaws.com
Hostname mismatch- Issued by (CA)
- Amazon
- Subject
- khoa-sandpit-build.sandpit.rapid-sys.com
- Valid from
- Dec 28, 2025
- Valid until
- Jan 26, 2027 (72 days remaining)
- Public key
- RSA 2048-bit
- Serial
- 076A29737BDD901800B772FE101CEF80
- SHA-256 fingerprint
- 88:3C:B2:9E:3F:62:E1:FE:C7:BF:6D:D9:80:7A:21:76:92:42:C1:C1:97:09:27:B5:65:2B:4E:8B:DB:AC:80:AE
- Chain
- Amazon RSA 2048 M01 → Amazon Root CA 1 → Starfield Services Root Certificate Authority - G2
Certificate Authority Authorization (CAA)
No CAA policy is published for this domain — any certificate authority may issue for it.
Never get surprised by ec2-16-144-129-100.us-west-2.compute.amazonaws.com's certificate expiring
This is today's certificate. Turn on monitoring and we'll watch ec2-16-144-129-100.us-west-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, CNAME, TXT 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.