solana/sdk/src/rpc_port.rs

/// Default port number for JSON RPC API
pub const DEFAULT_RPC_PORT: u16 = 8899;

/// Default port number for JSON RPC pubsub
pub const DEFAULT_RPC_PUBSUB_PORT: u16 = 8900;

/// Default port number for Banks RPC API
pub const DEFAULT_RPC_BANKS_PORT: u16 = 8901;