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Multiplayer mode allows people to play together cooperatively or versus one another both locally and via the Internet. Factorio supports both dedicated servers as well as player-hosted listen servers. In the past, the game used peer-to-peer connectivity, however this was removed as more robust options were developed. Saved world files can be seamlessly loaded in either single- or multiplayer. By default, all players on a server share technologies, unless a system of multiple teams has been instituted by the server host. Friendly fire is present. While the hard limit for number of players is 65,535 due to limitations of the SOCKET protocol, this number has never been reached; the most popular servers were able to successfully handle several hundred players at once. Players can share construction blueprints with other players on their server, via a public blueprint library.