SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
koelner-hoefe.com
SSL/TLS Certificate
SSL/TLS Certificate for koelner-hoefe.com
Self-signed- Issued by (CA)
- Plesk
- Subject
- Plesk
- Valid from
- Sep 11, 2023
- Valid until
- Sep 10, 2024 (expired 739 days ago)
- Public key
- RSA 2048-bit
- Serial
- 64FF27C9
- SHA-256 fingerprint
- 99:CF:8D:E2:A5:40:DE:0C:08:90:1B:40:90:5B:AC:95:85:7E:64:5F:4F:08:B0:E9:E2:4C:9D:7C:64:8A:0C:B5
- Chain
- Plesk
Certificate Authority Authorization (CAA)
No CAA policy is published for this domain — any certificate authority may issue for it.
This certificate has been served since Sep 2, 2026.
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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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