SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
SSL/TLS Certificate for s-fon.de
Hostname mismatch- Issued by (CA)
- Let's Encrypt
- Subject
- baygle.de
- Valid from
- May 19, 2026
- Valid until
- Aug 17, 2026 (7 days remaining)
- Public key
- RSA 2048-bit
- Serial
- 06F7BF2D5F2B9A532C531418C3800BABCE01
- SHA-256 fingerprint
- 10:BA:92:F9:13:46:78:3B:96:68:A1:D3:73:7F:79:58:E6:2A:B1:0C:3E:B3:29:E3:9D:B1:12:A7:84:FB:E5:BD
- Chain
- R12 → 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 s-fon.de's certificate expiring
This is today's certificate. Turn on monitoring and we'll watch s-fon.de continuously, notifying you the moment anything moves across all three signals:
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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