SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
it-group.pl
SSL/TLS Certificate
SSL/TLS Certificate for it-group.pl
Expired- Issued by (CA)
- Let's Encrypt
- Subject
- www.alexander.com.pl
- Valid from
- Jun 1, 2024
- Valid until
- Aug 30, 2024 (expired 701 days ago)
- Public key
- RSA 2048-bit
- Serial
- 035636F0D60554D031B85807B2B252B2B8A8
- SHA-256 fingerprint
- 01:E5:46:AA:67:49:7F:51:7F:7E:D2:CA:C5:81:FE:C4:C7:70:DB:DD:09:5B:17:C6:6D:29:24:25:16:82:5C:40
- Chain
- R3 → 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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