What is the fastest mach speed?

The fastest recorded speed achieved by an aircraft is approximately Mach 9.6, set by the North American X-15 rocket plane in 1967. This speed is about 7,310 miles per hour (11,750 kilometers per hour) at an altitude of around 102,000 feet. In terms of spacecraft, the Parker Solar Probe, launched in 2018, is expected to reach speeds of up to Mach 430,000 as it approaches the Sun.