Check SSL/TLS protocols and ciphers supported by a server.

# To test a server (run every check) on port 443:
testssl <example.com>

# To test a different port:
testssl <example.com:465>

# To only check available protocols:
testssl --protocols <example.com>

# To only check vulnerabilities:
testssl --vulnerable <example.com>

# To only check HTTP security headers:
testssl --headers <example.com>