SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
duffl.app
SSL/TLS Certificate
SSL/TLS Certificate for duffl.app
Valid- Issued by (CA)
- Amazon
- Subject
- www.duffl.app
- Valid from
- Jun 6, 2026
- Valid until
- Dec 20, 2026 (103 days remaining)
- Public key
- RSA 2048-bit
- Serial
- 097603382CF8E2A67DC1A4105AC46AE0
- SHA-256 fingerprint
- 1E:12:E3:E3:C4:2C:E4:86:CD:84:A5:77:1C:3F:7F:DA:67:27:BD:E4:58:DA:9B:E5:D2:12:CC:33:21:C2:A1:92
- Chain
- Amazon RSA 2048 M01 → 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.
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Uptime
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DNS changes
We watch NS, MX, CAA, DNSSEC, CNAME 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.
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