According to NASA, none of the planets in the solar system are known to have exactly four moons. It is noted that Jupiter has four large moons, known as the Galilean Satellites, but the gas giant might have up to 46 additional smaller moons.
NASA reports that neither Mercury nor Venus have any moons. Earth has only a single moon of significant size. Mars has two sizable moons, Deimos and Phobos. Jupiter is believed to have 50 moons, while Saturn has 53. Uranus has 27 moons large enough to be detected from Earth, Neptune has 13, and the dwarf planet Pluto has three.