6400

6400 or variation, may refer to:

In general

 * A.D. 6400, a year in the 7th millennium CE
 * 6400 BCE, a year in the 7th millennium BC
 * 6400, a number in the 6000 (number) range

Electronics and computing

 * Texas Instruments 6400 series ICs, a variant of the 7400-series integrated circuits
 * IBM 6400 Accounting Machine
 * IBM 6400, a family of printers
 * CDC 6400. a mainframe computer
 * Power Macintosh 6400 personal computer

Rail

 * Bangladesh Railway Class 6400, a diesel locomotive train class
 * GWR 6400 Class, a pannier tank steam locomotive train class
 * NS Class 6400, a class of diesel-electric locomotive train

Other uses

 * 6400 Georgealexander, an asteroid in the Asteroid Belt, the 6400th asteroid registered; see List_of_minor_planets:_6001–7000
 * 6400 (District of Përmet), one of the postal codes in Albania