SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
comnetzwerk.biz
SSL/TLS Certificate
SSL/TLS Certificate for comnetzwerk.biz
Self-signed- Issued by (CA)
- ComNetzwerk Inh. A.Diessner
- Subject
- comnetzwerk
- Valid from
- Aug 28, 2019
- Valid until
- Aug 27, 2020 (expired 2225 days ago)
- Public key
- RSA 2048-bit
- Serial
- 5D663D4F0007814E
- SHA-256 fingerprint
- 12:D6:94:C6:38:AA:A0:79:6C:B7:F2:42:F5:62:1A:8A:0E:3E:DB:F5:9C:A0:D5:A1:C3:12:4C:11:F9:F4:A6:79
- Chain
- comnetzwerk
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 21, 2026.
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Uptime
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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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