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 ost-haessler.de

Expired
Issued by (CA)
DigiCert Inc
Subject
www.ost-haessler.de
Valid from
May 18, 2018
Valid until
May 17, 2020 (expired 2342 days ago)
Public key
RSA 2048-bit
Serial
02BC95FEB51F0DDE55F7E80AF0209A0C
SHA-256 fingerprint
42:44:D3:C3:BD:2C:D6:C9:CC:E0:CD:83:2C:F0:C2:66:94:19:40:80:03:51:A0:CC:2A:9A:4F:0D:17:F7:EC:42
Chain
Thawte TLS RSA CA G1 → DigiCert Global Root G2
Subject Alternative Names (2)
ost-haessler.de, www.ost-haessler.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 Aug 6, 2026.

Never get surprised by ost-haessler.de's certificate expiring

This is today's certificate. Turn on monitoring and we'll watch ost-haessler.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.