A network socket connector with built-in IP BOX function includes a base, a front cover, a circuit board, an upper cover and a metallic housing. A hinge plate pivotally attaches a butt plate to the rearward end of the housing, movable between an open position and a closed position. The biasing unit generates a reference voltage by Complementary Metal-Oxide-Semiconductor transistors, wherein the positive input of the first amplifier is configured to receive the reference voltage.