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 ttu.ee
Valid- Issued by (CA)
- Hellenic Academic and Research Institutions CA
- Subject
- *.ttu.ee
- Valid from
- Sep 10, 2026
- Valid until
- Mar 28, 2027 (136 days remaining)
- Public key
- RSA 2048-bit
- Serial
- 3182681D784A463DA351E8289F1C3C0A
- SHA-256 fingerprint
- 4C:8B:BD:0F:C5:EB:8E:09:5C:11:3C:E3:D9:AF:E0:00:65:37:6F:AF:2C:BF:A0:56:D7:93:F5:F1:85:FE:84:ED
- Chain
- GEANT TLS RSA 1 → HARICA TLS RSA Root CA 2021
Certificate Authority Authorization (CAA)
No CAA policy is published for this domain — any certificate authority may issue for it.
We've observed 1 previous certificate for this host. This certificate has been served since Sep 14, 2026.
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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.
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