Kepler-171 is a Sun-like G-type star (about 0.98 solar masses, 5,642 K, 0.84 solar radii), 864 light-years from Earth. Kepler-171 b is a planet with 2.3 Earth radii, with an orbital period of 4.2 days, at 0.050 AU from its star, discovered in 2014 via transit. Kepler-171 c is a planet with 2.6 Earth radii, with an orbital period of 11.5 days, at 0.098 AU from its star, discovered in 2014 via transit. Kepler-171 d is a planet with 1.9 Earth radii, with an orbital period of 39.6 days, at 0.223 AU from its star, discovered in 2014 via transit.