SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
joern-berg.de
SSL/TLS Certificate
SSL/TLS Certificate for joern-berg.de
Self-signed- Issued by (CA)
- joern-berg.de.df-386909.dummy
- Subject
- joern-berg.de.df-386909.dummy
- Valid from
- May 28, 2025
- Valid until
- May 28, 2026 (expired 57 days ago)
- Public key
- RSA 2048-bit
- Serial
- 01B3B894E9
- SHA-256 fingerprint
- 20:E4:0D:FE:D9:B5:8F:E9:2A:9B:48:CD:4D:2F:87:9A:C7:44:4E:A8:30:C1:A2:86:81:2D:0B:3F:21:76:52:0C
- Chain
- joern-berg.de.df-386909.dummy
Certificate Authority Authorization (CAA)
No CAA policy is published for this domain — any certificate authority may issue for it.
Never get surprised by joern-berg.de's certificate expiring
This is today's certificate. Turn on monitoring and we'll watch joern-berg.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.
Free for your first domain: uptime, DNS, and certificate together. No credit card.