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 umkc.pl
Hostname mismatch- Issued by (CA)
- Asseco Data Systems S.A.
- Subject
- *.e-kei.pl
- Valid from
- Dec 15, 2025
- Valid until
- Dec 15, 2026 (146 days remaining)
- Public key
- RSA 4096-bit
- Serial
- 60A76AED74AA47B86093E021309255B6
- SHA-256 fingerprint
- DD:0D:46:FB:45:70:3D:6A:0D:4F:77:3C:89:CA:EB:E4:C7:EC:17:12:B7:A8:42:32:B0:FB:95:47:EB:1C:55:7B
- Chain
- Certum DV TLS G2 R39 CA → Certum Trusted Root CA → Certum Trusted Network CA
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 umkc.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.
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