How to Check the TLS version on a Server

[Vineesh K P]

Hi there,

Today, I am going to share you a handy way to find out the TLS version of any server or domain using the openssl command.

Using IP address

You can run the following command to see more information about SSL/TLS package on that server using the IP address.

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openssl s_client -connect 123.123.123.123:443
You will get a detailed information here. Scroll down to the section SSL-Section where you can see the TLS version in the Protocol field. like shown in the example below.

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SSL-Session:
    Protocol  : TLSv1.2
    Cipher    : ECDHE-RSA-AES128-SHA256

Using Domain Name

You can also use domain name as well by using the following command.

Code: [Select]

openssl s_client -connect example.com:443
Hope you find this useful.

Thank you.