$ openssl s_client -connect localhost:6697 -servername test.hackint.org -tlsextdebug 
[...]
Certificate chain
 0 s:/C=CH/ST=test.hackint.org/L=test.hackint.org/O=test.hackint.org/OU=test.hackint.org/CN=test.hackint.org/emailAddress=test.hackint.org
   i:/C=CH/ST=test.hackint.org/L=test.hackint.org/O=test.hackint.org/OU=test.hackint.org/CN=test.hackint.org/emailAddress=test.hackint.org
[...]
:test.hub NOTICE * :*** You are connected with TLS



$ openssl s_client -connect localhost:6697 -servername test2.hackint.org -tlsextdebug
[...]
Certificate chain
 0 s:/C=DE/ST=test2.hackint.org/L=test2.hackint.org/O=test2.hackint.org/OU=test2.hackint.org/CN=test2.hackint.org/emailAddress=test2.hackint.org
   i:/C=DE/ST=test2.hackint.org/L=test2.hackint.org/O=test2.hackint.org/OU=test2.hackint.org/CN=test2.hackint.org/emailAddress=test2.hackint.org
-[...]
:test.hub NOTICE * :*** You are connected with TLS