Hello @generosus,
Thank you for your question. The version of the service can be located through telnet after logging into the hosting account via SSH. The current major stable release on the servers is 1.6.9.
$ telnet 127.0.0.1 11211
Trying 127.0.0.1…
Connected to 127.0.0.1.
Escape character is '^]'.
version
VERSION 1.6.9
However, as it is with almost all software installations on our servers, we keep a stable version which is compatible with most applications – both new and older, but the code is further patched by our security and administrator teams with the latest security patches and releases. This makes the software both widely compatible, but also up to date with the latest code release of the software as of today.
Regards,
Plamen.M
Tech Support Team
SiteGround.com