SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
uni-koeln.de
SSL/TLS Certificate
SSL/TLS Certificate for uni-koeln.de
Valid- Issued by (CA)
- Let's Encrypt
- Subject
- uni-koeln.de
- Valid from
- Jul 25, 2026
- Valid until
- Oct 23, 2026 (86 days remaining)
- Public key
- EC 384-bit
- Serial
- 055C405295A118F02CA48F99BC46CCF92B02
- SHA-256 fingerprint
- BE:CC:2B:52:F0:19:C6:01:6A:87:F5:90:01:A5:A0:DE:C4:BC:D5:50:A3:8E:75:4F:4F:B1:0C:3A:79:D6:42:8D
- 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.
Never get surprised by uni-koeln.de's certificate expiring
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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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