SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
SSL/TLS Certificate for tbbf.at
Self-signed- Issued by (CA)
- tbbf.at.df-294293.dummy
- Subject
- tbbf.at.df-294293.dummy
- Valid from
- Sep 20, 2025
- Valid until
- Sep 20, 2026 (expired 2 days ago)
- Public key
- RSA 2048-bit
- Serial
- 020C49CC56
- SHA-256 fingerprint
- 9E:A8:A5:CC:5E:53:E9:84:EE:A9:3B:1E:AA:B7:3E:C9:08:5E:98:C9:3F:8A:AF:60:A3:D7:7B:59:89:EE:F7:11
- Chain
- tbbf.at.df-294293.dummy
Certificate Authority Authorization (CAA)
No CAA policy is published for this domain — any certificate authority may issue for it.
This certificate has been served since Sep 15, 2026.
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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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