SSL Certificate Check

Check your site’s SSL certificate validity, issuer, expiry date and covered hostnames.

Example: www.uzmantescil.com.tr google.com

Certificate valid

google.com

Subject (CN): *.google.com
Issuer: Google Trust Services
Valid from: October 7, 2026
Expires: December 30, 2026 (56 days left)
Protocol: TLSv1.2
Cipher: ECDHE-ECDSA-AES128-GCM-SHA256

Covered hostnames (SAN)

*.google.com
*.appengine.google.com
*.bdn.dev
*.origin-test.bdn.dev
*.cloud.google.com
*.crowdsource.google.com
*.datacompute.google.com
*.google.ca
*.google.cl
*.google.co.in
*.google.co.jp
*.google.co.uk
*.google.com.ar
*.google.com.au
*.google.com.br
*.google.com.co
*.google.com.mx
*.google.com.tr
*.google.com.vn
*.google.de
*.google.es
*.google.fr
*.google.hu
*.google.it
*.google.nl
*.google.pl
*.google.pt
*.gemini.cloud.google.com
*.gstatic.com
*.metric.gstatic.com
*.gvt1.com
*.gcpcdn.gvt1.com
*.gvt2.com
*.gcp.gvt2.com
*.url.google.com
*.youtube-nocookie.com
*.ytimg.com
ai.android
android.com
*.android.com
*.flash.android.com
g.co
*.g.co
goo.gl
www.goo.gl
google-analytics.com
*.google-analytics.com
google.com
googlecommerce.com
*.googlecommerce.com
urchin.com
*.urchin.com
youtu.be
youtube.com
*.youtube.com
music.youtube.com
*.music.youtube.com
youtubeeducation.com
*.youtubeeducation.com
youtubekids.com
*.youtubekids.com
yt.be
*.yt.be
android.clients.google.com
*.aistudio.google.com

All tools Look Up

What the SSL check shows

The tool connects to port 443 and reads the subject, issuer, start date, expiry, days left, protocol, cipher and the SAN list. Under 30 days uses a warning color. An expired certificate uses an error color.

A certificate does not mean the whole site is hardened. Mixed content, HSTS and redirects live on the security headers and HTTP tools.

Field	What to look at
Subject (CN)	The name written on the certificate
Issuer	Let’s Encrypt, a commercial CA, or a CDN
Expiry and days left	Whether auto-renewal is working
Protocol	TLS 1.2 or 1.3
SAN	Whether both www and the bare domain are listed

Before the certificate expires

Keep auto-renewal on in the hosting or CDN panel. Certificates installed by hand get forgotten, and the browser then says the site is not private. If the SAN lists only www, the bare domain can warn. Both names should be on the same certificate.

Frequently asked questions

What does the SSL check show?

Who the certificate is for, who issued it, when it expires, which names it covers and which TLS version was negotiated.

What if few days are left?

Turn on auto-renewal. Let’s Encrypt on most hosting plans renews itself, but you should still watch the date.

I get a connection error

Port 443 may be closed, the certificate may be missing, or the A record may point at the wrong address. Check DNS first.

What is a SAN?

The extra names on the certificate. If www or the bare domain is missing, browsers warn on that host.

Is a free certificate unsafe?

No. Trust depends on a valid date and a matching name. A commercial brand is not automatically stronger.