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 l-l.cat
Hostname mismatch- Issued by (CA)
- Let's Encrypt
- Subject
- portals.cpl.upc.edu
- Valid from
- Aug 27, 2026
- Valid until
- Nov 25, 2026 (80 days remaining)
- Public key
- EC 256-bit
- Serial
- 0516C398DB7809170032EE47E1F5F85C0389
- SHA-256 fingerprint
- E5:07:F0:87:89:78:2C:99:7D:46:D4:64:63:30:CF:55:DE:2E:FF:C9:82:9B:B7:20:FD:18:B1:73:07:A5:F4:26
- Chain
- YE1 → Root YE → ISRG Root X2 → ISRG Root X1
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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