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 derplan-b.de

Valid
Issued by (CA)
Sectigo Limited
Subject
derplan-b.de
Valid from
Feb 8, 2026
Valid until
Feb 22, 2027 (140 days remaining)
Public key
RSA 2048-bit
Serial
A9141662DEFDDF78E5E9CD27006725E9
SHA-256 fingerprint
C0:CE:E3:73:74:7E:0F:A3:7B:98:4B:74:8F:E5:EF:91:33:A5:99:98:85:6A:78:97:2B:D7:F0:84:71:4B:8C:91
Chain
Sectigo Public Server Authentication CA DV R36 → Sectigo Public Server Authentication Root R46 → USERTrust RSA Certification Authority
Subject Alternative Names (2)
derplan-b.de, www.derplan-b.de

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 Sep 23, 2026.

Never get surprised by derplan-b.de's certificate expiring

This is today's certificate. Turn on monitoring and we'll watch derplan-b.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.