Depends on the client. Official Activision servers are long gone. Private server communities (e.g., ReactPS, COD4X) still host dozens of active servers worldwide—Europe and North America are best. Expect 100–300 concurrent players on popular modded servers (promod, freeze tag, zombies). Not thriving, but alive enough for nightly matches.
The multiplayer-only download is usually free (though legally grey if not tied to a purchased license). If you already own the full game on disc/Steam, you can extract the MP component. If you find a legitimate free release (e.g., from a trusted LAN tournament pack), it’s unbeatable value. Otherwise, buying the full game on sale ($5–10) is safer and includes the campaign. call of duty 4 multiplayer only download
The core loop remains untouched: fast-paced, grounded gunplay, killstreaks (3–5–7), create-a-class, and iconic maps like Crash , Crossfire , and Shipment . Progression is fully intact, though some clients unlock everything from the start. Hit registration and movement feel crisp even at high ping. No wallrunning, no specialists—just raw aim, positioning, and map knowledge. Depends on the client