SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
seat-centrum-koeln.com
SSL/TLS Certificate
SSL/TLS Certificate for seat-centrum-koeln.com
Self-signed- Issued by (CA)
- server10.myssdhost.de
- Subject
- server10.myssdhost.de
- Valid from
- Sep 24, 2026
- Valid until
- Sep 24, 2027 (360 days remaining)
- Public key
- RSA 4096-bit
- Serial
- 1811D5D9E20DBFAC1C88F8F3682041D2A052159C
- SHA-256 fingerprint
- 39:08:19:CE:9D:86:67:58:24:9A:41:F8:DF:63:70:05:FB:09:4B:B2:C4:C6:72:B5:B5:33:E0:B9:08:09:12:DC
- Chain
- server10.myssdhost.de
Certificate Authority Authorization (CAA)
No CAA policy is published for this domain — any certificate authority may issue for it.
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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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