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 itsec.pt
Valid- Issued by (CA)
- Let's Encrypt
- Subject
- itsec.pt
- Valid from
- Sep 8, 2026
- Valid until
- Dec 7, 2026 (73 days remaining)
- Public key
- RSA 4096-bit
- Serial
- 05291E79DDE7654E3499FEDC511C32BA98A9
- SHA-256 fingerprint
- 61:A5:50:10:23:CA:54:96:42:45:B5:E3:D2:B5:3C:FE:8E:69:FA:1B:A4:D0:52:92:45:BE:BA:3F:B3:A7:E3:1D
- Chain
- YR2 → Root YR → 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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This is today's certificate. Turn on monitoring and we'll watch itsec.pt 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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