SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
zerom-jg.edu.pl
SSL/TLS Certificate
SSL/TLS Certificate for zerom-jg.edu.pl
Valid- Issued by (CA)
- Let's Encrypt
- Subject
- zerom-jg.edu.pl
- Valid from
- Oct 7, 2026
- Valid until
- Jan 5, 2027 (83 days remaining)
- Public key
- EC 256-bit
- Serial
- 062338D003B48FD25C21B35E0FB6165B5277
- SHA-256 fingerprint
- 1A:7C:BE:24:24:3C:58:5F:E6:45:E0:4C:5B:B8:32:A1:3F:83:FB:B7:3A:35:4D:BA:DD:F8:E4:27:6F:98:56:13
- Chain
- YE2 → 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.
We've observed 1 previous certificate for this host. This certificate has been served since Oct 8, 2026.
Never get surprised by zerom-jg.edu.pl's certificate expiring
This is today's certificate. Turn on monitoring and we'll watch zerom-jg.edu.pl continuously, notifying you the moment anything moves across all three signals:
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, 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.
Free for your first domain: uptime, DNS, and certificate together. No credit card.