Call of Duty 4: Modern Warfare — No Cross-Play Between PC & Xbox 360

No cross-play exists. CoD4 (2007) has **completely separate** online ecosystems:

• PC: IWNet / Steam (now Steamworks) — dedicated servers, mods, console commands.
• Xbox 360: Xbox Live — matchmaking, peer-to-peer host, no mods.
• PS3: PlayStation Network — separate from both.

Why?

• Different netcode, patch cycles, input balance (mouse vs. controller), anti-cheat.
• Cross-play wasn't a concept in 2007; platform holders (Microsoft/Sony) blocked it.
• PC version allows **Promod** (competitive mod) — incompatible with console.

What *Does* Have Cross-Play

CoD4 Today

• PC (Steam): ~500–2,000 concurrent. **Promod** servers active. Cod4x client adds anti-cheat, widescreen, server browser.
• Xbox 360 (Back Compat on Series X|S): Populated but **hacked lobbies common** (mod menus, infections). No official support since 2014.
• PS3: Dead / hacked.

Bottom Line: CoD4 PC and Xbox 360 **cannot play together**. For cross-play CoD, play any title from **MW2019 onward**.