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 rsg-in-berlin.de

Expired
Issued by (CA)
Let's Encrypt
Subject
rsg-in-berlin.de
Valid from
Sep 20, 2025
Valid until
Dec 19, 2025 (expired 320 days ago)
Public key
RSA 2048-bit
Serial
05341370A02166AD094907A57FE7705E5F9B
SHA-256 fingerprint
F7:9A:2C:43:17:D8:B3:FC:1C:10:4E:DD:D6:BD:F8:22:6F:90:58:CB:1B:06:43:0C:F0:4C:DC:47:30:8C:26:81
Chain
R12 → ISRG Root X1
Subject Alternative Names (2)
rsg-in-berlin.de, www.rsg-in-berlin.de

Certificate Authority Authorization (CAA)

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

Never get surprised by rsg-in-berlin.de's certificate expiring

This is today's certificate. Turn on monitoring and we'll watch rsg-in-berlin.de continuously, notifying you the moment anything moves across all three signals:

Certificate monitor showing the issuer, expiry date, chain status, fingerprint, covered names, and a history of a rotation and an expiry warning

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, CNAME, TXT 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.