SSL/TLS Certificate Lookup

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

ec2-34-208-227-42.us-west-2.compute.amazonaws.com

SSL/TLS Certificate

SSL/TLS Certificate for ec2-34-208-227-42.us-west-2.compute.amazonaws.com

Hostname mismatch
Issued by (CA)
Amazon
Subject
sfw.upside.tech
Valid from
Oct 5, 2026
Valid until
Apr 20, 2027 (158 days remaining)
Public key
RSA 2048-bit
Serial
045A6307CAB060F8B5C5983E9D42ABC3
SHA-256 fingerprint
54:B6:5F:E4:4A:BE:B0:14:8C:89:F9:E5:69:11:5D:15:DF:95:A9:28:F0:2F:08:5D:52:BE:D5:AF:4B:DB:6D:AE
Chain
Amazon RSA 2048 M01 → Amazon Root CA 1 → Starfield Services Root Certificate Authority - G2
Subject Alternative Names (1)
sfw.upside.tech

Certificate Authority Authorization (CAA)

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

Never get surprised by ec2-34-208-227-42.us-west-2.compute.amazonaws.com's certificate expiring

This is today's certificate. Turn on monitoring and we'll watch ec2-34-208-227-42.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.