SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
my-site.app
SSL/TLS Certificate
SSL/TLS Certificate for my-site.app
Valid- Issued by (CA)
- Amazon
- Subject
- my-site.app
- Valid from
- Dec 7, 2025
- Valid until
- Jan 5, 2027 (79 days remaining)
- Public key
- RSA 2048-bit
- Serial
- 0265422F08777C0239969A72C0700422
- SHA-256 fingerprint
- AF:31:77:DC:D9:69:5A:B2:B6:86:F0:25:23:22:EE:F7:E0:3E:6C:E1:66:EA:F1:65:ED:7A:E5:1A:50:8A:C9:F6
- 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 my-site.app's certificate expiring
This is today's certificate. Turn on monitoring and we'll watch my-site.app 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.