SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
dt-net.de
SSL/TLS Certificate
SSL/TLS Certificate for dt-net.de
Self-signed- Issued by (CA)
- dt-net.de.df-300228.dummy
- Subject
- dt-net.de.df-300228.dummy
- Valid from
- Sep 23, 2025
- Valid until
- Sep 23, 2026 (45 days remaining)
- Public key
- RSA 2048-bit
- Serial
- 01E873CF39
- SHA-256 fingerprint
- 31:A7:F1:80:52:FA:CC:37:22:6B:EA:65:07:F7:50:AC:84:5E:05:C1:18:CE:96:72:59:70:5C:40:DD:20:95:D6
- Chain
- dt-net.de.df-300228.dummy
Certificate Authority Authorization (CAA)
No CAA policy is published for this domain — any certificate authority may issue for it.
Never get surprised by dt-net.de's certificate expiring
This is today's certificate. Turn on monitoring and we'll watch dt-net.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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