The most active multiplayer communities for Dominions are on Discord. Discord is an instant messaging social platform where people can join servers based on their interests and find others who also enjoy Dominions.
These servers host Dominions games, provide advice to newer players, and discuss strategies for each nation. Although Illwinter now has their own hosting services, much of the multiplayer Dominions community continues to use Mr. Clockwork, carrying over from Dominions 4/5, alongside the newer Envoy tool. Both are common throughout these servers.
Rather than hosting games and discussing Dominions in general, these servers focus on technical projects or more specific information.