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 dersa-it.de

Valid
Issued by (CA)
Sectigo Limited
Subject
*.dersa-it.de
Valid from
Sep 13, 2026
Valid until
Mar 26, 2027 (161 days remaining)
Public key
RSA 2048-bit
Serial
0CE751880F0D5D0BD9B973BC4B476396
SHA-256 fingerprint
4F:C0:03:DC:0F:D2:29:97:4F:0D:77:03:5F:80:4B:5C:86:6F:9F:4B:E0:02:E8:AB:FB:DE:C6:CD:48:6F:AA:B6
Chain
Sectigo Public Server Authentication CA DV R36 → Sectigo Public Server Authentication Root R46 → USERTrust RSA Certification Authority
Subject Alternative Names (2)
*.dersa-it.de, dersa-it.de

Certificate Authority Authorization (CAA)

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

Never get surprised by dersa-it.de's certificate expiring

This is today's certificate. Turn on monitoring and we'll watch dersa-it.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.