: Currently considered the most stable and popular option. It allows you to host your own server or join public ones, supporting both GTA IV and its expansions.

: Most custom servers require version 1.0.7.0 or 1.0.8.0 . You may need to use a downgrader tool if you have the Steam "Complete Edition".

The most reliable way to find and join servers is through dedicated launchers that bypass the retired Games for Windows Live (GFWL) system:

: Open the server browser within the launcher to find active lobbies. Popular modes include Free Mode "mayhem" and organized Roleplay (RP) servers. Grand Theft Auto IV's Multiplayer is Still Absolute Mayhem

: In the launcher settings, set the executable path to your GTAIV.exe in the game's main directory.