SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
umsonst-telefonieren.net
SSL/TLS Certificate
SSL/TLS Certificate for umsonst-telefonieren.net
Hostname mismatch- Issued by (CA)
- ZeroSSL
- Subject
- telefonieren.com
- Valid from
- Oct 27, 2025
- Valid until
- Oct 27, 2026 (96 days remaining)
- Public key
- RSA 2048-bit
- Serial
- 8D3B28CFA63D9542060C2BE7786129DB
- SHA-256 fingerprint
- 30:E8:22:6A:89:A0:99:85:D1:70:CF:04:E9:D9:BC:FB:5D:34:33:21:01:5C:17:46:42:B4:F3:60:31:59:F3:5D
- Chain
- ZeroSSL RSA Domain Secure Site CA → USERTrust RSA Certification Authority
Certificate Authority Authorization (CAA)
No CAA policy is published for this domain — any certificate authority may issue for it.
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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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