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 stj.de
Self-signed- Issued by (CA)
- ispgateway
- Subject
- webslave.ispgateway.de
- Valid from
- Jan 20, 2026
- Valid until
- Jun 7, 2053 (9813 days remaining)
- Public key
- RSA 4096-bit
- Serial
- 366014AD7AE012A0E38DCE7EA430F49A9E861523
- SHA-256 fingerprint
- 72:D0:5E:1C:20:9B:F1:7A:A9:5F:D7:36:50:43:66:3A:9F:3F:11:E2:0F:89:F0:49:C2:1D:62:79:D0:67:43:C4
- Chain
- webslave.ispgateway.de
Certificate Authority Authorization (CAA)
No CAA policy is published for this domain — any certificate authority may issue for it.
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This is today's certificate. Turn on monitoring and we'll watch stj.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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