Can You Play Star Fox 64 Online?

Not officially. The N64 original has no online multiplayer. However, community solutions exist:

Community Online Play

• Project64 + Netplay: Use Project64 (v2.3+) with built-in netplay (UDP/STUN). Requires same ROM hash, good ping.
• RetroArch + Netplay: Core Mupen64Plus-Next or Parallel-N64; host/join via RetroArch's MITM server.
• XLink Kai / Parsec: Tunnel local multiplayer over internet (works for 2P VS mode).

Official Online Versions

• Star Fox 64 3D (3DS) – Local wireless + **Internet multiplayer** (4 players, download play supported).
• Star Fox Zero (Wii U) – Online co-op/versus (Gyro aiming).

For the authentic N64 feel with friends, Project64 netplay is the most accessible route today.