SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
a-tower.pt
SSL/TLS Certificate
SSL/TLS Certificate for a-tower.pt
Valid- Issued by (CA)
- Google Trust Services
- Subject
- a-tower.pt
- Valid from
- Jul 17, 2026
- Valid until
- Oct 15, 2026 (85 days remaining)
- Public key
- EC 256-bit
- Serial
- 51664C9B6431E20D13C4EC128E69FEAF
- SHA-256 fingerprint
- 18:CB:A0:5D:07:4E:B6:01:0B:AC:FF:9C:3E:BB:C7:F1:DA:6E:7E:98:BF:3E:20:58:1C:BF:D9:55:56:75:1C:B4
- Chain
- WE1 → GTS Root R4
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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