SSL certificate checker

Looking to register a domain? Search availability →

How to use this tool

1

Enter a domain

Type the domain or hostname whose certificate you want to inspect, for example example.com.

2

Fetch the certificate

ns6 opens a TLS connection and reads the certificate the server presents — nothing to install.

3

Review issuer and expiry

See who issued the certificate, when it expires, how many days remain, and every hostname (SAN) it covers.

4

Renew before it lapses

If expiry is close, renew or reissue at your host. Domains registered at ns6 include free auto-renewing SSL.

An SSL or TLS certificate is what turns http into https and shows the padlock in the browser. It encrypts traffic between your visitors and your server and proves the site is who it claims to be. Certificates expire, and an expired one throws a browser warning that drives visitors away.

This checker reads the certificate your server is actually serving, so you can see the issuer, the exact expiry date, how many days are left, and every hostname the certificate covers. Every domain registered at ns6 includes free, auto-renewing SSL so you never get caught out by an expiry.

Frequently asked questions

It reads the certificate your server presents and reports the issuer, the expiry date, the days remaining, and every hostname (SAN) the certificate covers.

The checker shows the exact expiry date and a countdown of days remaining. An expired certificate causes browsers to show a full-page security warning.

A Subject Alternative Name is an extra hostname a certificate secures. A certificate must list every hostname you serve over https — a missing SAN causes a name-mismatch error.

Certificates are issued by Certificate Authorities such as Let’s Encrypt, DigiCert or Google Trust Services. The checker shows which one signed the certificate you’re inspecting.

It depends on the issuer — Let’s Encrypt certificates last 90 days, while paid certificates often last a year. Automating renewal avoids surprise outages.

Yes. Every domain registered at ns6 includes free, auto-renewing SSL, so your site stays secure without manual renewals.