SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
tessera.systems
SSL/TLS Certificate
SSL/TLS Certificate for tessera.systems
Valid- Issued by (CA)
- Amazon
- Subject
- tessera.systems
- Valid from
- Sep 26, 2026
- Valid until
- Apr 11, 2027 (194 days remaining)
- Public key
- RSA 2048-bit
- Serial
- 012D92AC6756B8C47BE6AFA965E3C0B6
- SHA-256 fingerprint
- 04:3D:9C:BD:FD:F4:AC:78:27:8D:65:DC:5A:D6:B6:22:C6:4D:57:2B:6D:A2:0C:78:52:B7:96:7A:2A:C1:CD:A6
- 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.
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This is today's certificate. Turn on monitoring and we'll watch tessera.systems continuously, notifying you the moment anything moves across all three signals:
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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