This is a bungeecord plugin that tracks what domains players are using, it only counts unique logins to certain domains, and you can also view what domain players are currently using.
/domain <player> >> View the domain a player is on
/domain <domain> [timeframe] >> View the joins on a certain domain
/domains current >> View what domains players are currently using
/domains [timeframe] >> View unique joins on all domains used
domain.command.use >> Gives access to all commands