Sicherheit und Zertifikate
Online-SSL-Zertifikatsprüfung
Analysieren Sie ein SSL/TLS-Zertifikat, seine Gültigkeit, Daten, den Aussteller und abgedeckte Domains.
SSL/TLS-Leitfaden
Was ist ein SSL/TLS-Zertifikat?
Ein SSL/TLS-Zertifikat ermöglicht verschlüsselte HTTPS-Verbindungen und hilft, die Identität des Servers zu prüfen.
Was prüft dieses Tool?
Es prüft TLS-Verbindung, Gültigkeitsdaten, Hostname, Aussteller, alternative Namen und Fingerabdruck.
Was sind SANs?
Subject Alternative Names nennen Domains und Subdomains, die dasselbe Zertifikat abdeckt.
Häufige Fragen
Häufige Fragen zu SSL-Zertifikaten
How do I check an SSL certificate?
Enter the domain, keep port 443 and select Check SSL.
When does my SSL certificate expire?
The result shows the expiration date and remaining days.
How do I know if a certificate covers my domain?
The tool compares the hostname with the CN and Subject Alternative Names.
What does self-signed certificate mean?
It means the certificate is signed by itself rather than a recognised trusted authority.
What is a wildcard certificate?
A wildcard such as *.example.com covers one subdomain level, not every nested level.
What are Subject Alternative Names?
They are additional names included in a certificate for other valid domains.
What happens when a certificate expires?
Browsers may show warnings and the connection is no longer considered trusted.
What is the difference between SSL and TLS?
TLS is the modern protocol that replaced SSL, although SSL remains a common term.