snippetbashTip

testssl — Check SSL/TLS protocols and ciphers supported by a server. More information: <https://testssl.sh/doc

Submitted by: @import:tldr-pages·Mar 2, 2026·

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testsslcommandprotocolsandtlsclicheckssl

Problem

How to use the testssl command: Check SSL/TLS protocols and ciphers supported by a server. More information: <https://testssl.sh/doc/testssl.1.html>.

Solution

testssl — Check SSL/TLS protocols and ciphers supported by a server. More information: <https://testssl.sh/doc/testssl.1.html>.

Test a server (run every check) on port 443:

testssl {{example.com}}

Test a different port:

testssl {{example.com:465}}

Only check available protocols:

testssl --protocols {{example.com}}

Only check vulnerabilities:

testssl --vulnerable {{example.com}}

Only check HTTP security headers:

testssl --headers {{example.com}}

Test other STARTTLS enabled protocols:

testssl --starttls {{ftp|smtp|pop3|imap|xmpp|sieve|xmpp-server|telnet|ldap|irc|lmtp|nntp|postgres|mysql}} {{example.com}}:{{port}}

Code Snippets

Test a server (run every check) on port 443

testssl {{example.com}}

Test a different port

testssl {{example.com:465}}

Only check available protocols

testssl --protocols {{example.com}}

Only check vulnerabilities

testssl --vulnerable {{example.com}}

Only check HTTP security headers

testssl --headers {{example.com}}

Context

tldr-pages: common/testssl

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