SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
ec2-35-81-148-252.us-west-2.compute.amazonaws.com
SSL/TLS Certificate
SSL/TLS Certificate for ec2-35-81-148-252.us-west-2.compute.amazonaws.com
Hostname mismatch- Issued by (CA)
- Amazon
- Subject
- *.my.dev.us-west-2.nonprod.connect.aws.a2z.com
- Valid from
- Sep 21, 2026
- Valid until
- Apr 6, 2027 (151 days remaining)
- Public key
- RSA 2048-bit
- Serial
- 0483808149CFEA28D0C7A4F3CFB30634
- SHA-256 fingerprint
- 33:32:38:46:81:EE:48:82:8D:DB:3A:F8:89:52:AB:98:8C:1D:FA:3D:F0:BB:A1:8B:3B:64:75:E2:FB:A6:BD:6D
- Chain
- Amazon RSA 2048 M04 → 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 ec2-35-81-148-252.us-west-2.compute.amazonaws.com's certificate expiring
This is today's certificate. Turn on monitoring and we'll watch ec2-35-81-148-252.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.