SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
ec2-16-54-159-202.ca-central-1.compute.amazonaws.com
SSL/TLS Certificate
SSL/TLS Certificate for ec2-16-54-159-202.ca-central-1.compute.amazonaws.com
Hostname mismatch- Issued by (CA)
- Amazon
- Subject
- citybo.com
- Valid from
- Oct 20, 2026
- Valid until
- May 5, 2027 (179 days remaining)
- Public key
- RSA 2048-bit
- Serial
- 0FD23B508A22546A2B7D04B4649FDE68
- SHA-256 fingerprint
- 45:24:F7:3D:9B:CE:BC:47:14:FE:90:5D:57:34:5B:81:BF:9A:F7:4E:CB:9A:31:A5:BF:87:7C:E5:17:BF:10:1C
- 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 ec2-16-54-159-202.ca-central-1.compute.amazonaws.com's certificate expiring
This is today's certificate. Turn on monitoring and we'll watch ec2-16-54-159-202.ca-central-1.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.