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 sn-i.de

Self-signed
Issued by (CA)
Plesk
Subject
Plesk
Valid from
Feb 26, 2024
Valid until
Feb 25, 2025 (expired 591 days ago)
Public key
RSA 2048-bit
Serial
65DC9E3F
SHA-256 fingerprint
E4:5E:94:19:7C:40:B2:C4:40:E2:3A:D1:5C:2A:DE:8C:57:A1:63:64:EA:69:0B:A6:71:09:15:09:05:10:AD:D4
Chain
Plesk

Certificate Authority Authorization (CAA)

No CAA policy is published for this domain — any certificate authority may issue for it.

This certificate has been served since Oct 8, 2026.

Never get surprised by sn-i.de's certificate expiring

This is today's certificate. Turn on monitoring and we'll watch sn-i.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.

Monitor this certificate free

Free for your first domain: uptime, DNS, and certificate together. No credit card.