SSL/TLS Certificate Lookup

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

ec2-54-203-30-94.us-west-2.compute.amazonaws.com

SSL/TLS Certificate

SSL/TLS Certificate for ec2-54-203-30-94.us-west-2.compute.amazonaws.com

Hostname mismatch
Issued by (CA)
Amazon
Subject
*.us-west-2.prod.aws.tel.st.dev
Valid from
Sep 5, 2026
Valid until
Mar 21, 2027 (126 days remaining)
Public key
RSA 2048-bit
Serial
0A715BDFDE2F4FE053FB22210E78893E
SHA-256 fingerprint
4A:8B:05:17:9B:88:97:CF:43:31:FA:9A:27:F3:66:C4:20:33:B2:34:78:9C:A9:0A:08:9F:4B:6E:11:28:58:CE
Chain
Amazon RSA 2048 M01 → Amazon Root CA 1 → Starfield Services Root Certificate Authority - G2
Subject Alternative Names (2)
*.us-west-2.prod.aws.tel.st.dev, us-west-2.prod.aws.tel.st.dev

Certificate Authority Authorization (CAA)

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

Never get surprised by ec2-54-203-30-94.us-west-2.compute.amazonaws.com's certificate expiring

This is today's certificate. Turn on monitoring and we'll watch ec2-54-203-30-94.us-west-2.compute.amazonaws.com continuously, notifying you the moment anything moves across all three signals:

Certificate monitor showing the issuer, expiry date, chain status, fingerprint, covered names, and a history of a rotation and an expiry warning

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.

Monitor this certificate free

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