Update 01.032: Dedicated servers are now available in Space Engineers

Dedicated servers are now available in Space Engineers. Dedicated servers allow players to connect to a third party host, rather than using a player-host, in a peer-to-peer set-up. This feature will result to a faster connection and a more fluent multiplayer performance with less lag.

Source:

http://www.moddb.com/news/upda…ilable-in-space-engineers