What is a bulk SSL certificate checker?
A bulk SSL certificate checker inspects the TLS certificate that each server actually presents over HTTPS, for many hosts in a single pass. The certificate encrypts the connection between a visitor and a site and proves the site controls the domain it claims. The check returns who issued the certificate, who it was issued to, when it became valid, when it expires and which hostnames it covers, so website owners and security teams can confirm every host is live, correctly configured and not about to expire.
What the results mean
The issuer is the certificate authority that signed the certificate, the subject is the site the certificate belongs to, and the covered names list every hostname the certificate is valid for. Validity dates show the exact window in which browsers will trust the certificate.
Catch expiring certificates early
An expired certificate makes browsers show a security warning that can destroy trust in a site within minutes. Running a bulk SSL expiration checker across your hosts surfaces every certificate nearing its renewal window, so you can renew before visitors are blocked. The mass SSL expiry checker flags both expiring and already-expired certificates.
A batch SSL scanner for security teams
Security teams use a batch SSL scanner to audit a fleet of hosts for weak or expiring certificates, and to confirm that each hostname in a wildcard or multi-name certificate is actually covered by the listed SANs.
Frequently asked questions
Can I check SSL certificates in bulk?
Yes. Paste up to 25 hosts and each certificate is inspected in a single pass, with issuer, validity and covered names for every one.
What does an expired certificate mean?
The certificate is past its validity period, so modern browsers will warn or refuse to connect. The site needs a renewed certificate from its host or provider.
What should I do when an SSL certificate expires?
When an SSL certificate expires, renew or replace it immediately to restore HTTPS encryption and remove browser 'Not Secure' warnings. Most modern hosting providers offer free, automatic SSL certificates (such as Let's Encrypt or cPanel AutoSSL), which can be renewed instantly by logging into your hosting control panel and running AutoSSL or reinstalling the certificate. If using a commercial paid certificate, renew it with your provider, submit a CSR, and upload the updated certificate files (.crt & CA Bundle) in your SSL Manager. Afterwards, test in Incognito or force-refresh (Ctrl+F5 / Cmd+Shift+R) to clear cached browser errors.
Why does the tool say no certificate?
The host may not support HTTPS, may serve the certificate on a different port, or may have been unreachable from the lookup location.
What are the covered names (SANs)?
Subject Alternative Names list every hostname the certificate is valid for, such as example.com and www.example.com.