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 bau-plattform.com

Valid
Issued by (CA)
Let's Encrypt
Subject
bau-plattform.com
Valid from
Sep 6, 2026
Valid until
Dec 5, 2026 (66 days remaining)
Public key
RSA 4096-bit
Serial
0543E5CBB95886E6B278AF3EC8E6F263FF90
SHA-256 fingerprint
06:41:A4:4B:89:55:E7:2E:25:00:F7:32:71:D0:4D:7C:2B:0D:3F:FB:62:7F:AA:E3:FC:60:2B:7B:61:C3:BE:97
Chain
YR1 → Root YR → ISRG Root X1
Subject Alternative Names (66)
*.bau-plattform.com, *.dokumenteundplaene.de, *.dup-app.cloud, *.dup-app.com, *.dup-cloud.app, *.dup-cloud.com, *.dup-cloud.de, *.dup-simplify.de, *.dup-traub.de, *.dupapp.cloud, *.dupapp.de, *.gewerbebau-ravensburg.de, *.holger-traub.de, *.industriebau-ravensburg.de, *.kleine-werkstatt23.de, *.kleinewerkstatt23.de, *.manufaktur23.de, *.projektcloud.app, *.sterkel-areal.de, *.trainno.de, *.traub-architekten-ingenieure.com, *.traub-architekten-ingenieure.de, *.traub-bau.de, *.traub-ingenieure-architekten.com, *.traub-ingenieure-architekten.de, *.traub-ingenieure.de, *.traub-innovation.com, *.traub-innovation.de, *.traub-pm.de, *.traub-projektbau.com, *.traub-projektbau.de, *.traub-projektentwicklung.com, *.traub-projektentwicklung.de, bau-plattform.com, dokumenteundplaene.de, dup-app.cloud, dup-app.com, dup-cloud.app, dup-cloud.com, dup-cloud.de, dup-simplify.de, dup-traub.de, dupapp.cloud, dupapp.de, gewerbebau-ravensburg.de, holger-traub.de, industriebau-ravensburg.de, kleine-werkstatt23.de, kleinewerkstatt23.de, manufaktur23.de, projektcloud.app, sterkel-areal.de, trainno.de, traub-architekten-ingenieure.com, traub-architekten-ingenieure.de, traub-bau.de, traub-ingenieure-architekten.com, traub-ingenieure-architekten.de, traub-ingenieure.de, traub-innovation.com, traub-innovation.de, traub-pm.de, traub-projektbau.com, traub-projektbau.de, traub-projektentwicklung.com, traub-projektentwicklung.de

Certificate Authority Authorization (CAA)

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

Never get surprised by bau-plattform.com's certificate expiring

This is today's certificate. Turn on monitoring and we'll watch bau-plattform.com 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.