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In computing65535 is a frequently occurring number in the field of computing because it is the highest number which can be represented by an unsigned 16 bit binary number. Some computer programming environments may have pre-defined constant values representing 65535, with names like "MAX_UNSIGNED_SHORT". In older computers with processors operating with a 16-bit address bus (such as the MOS Technology 6502 and the Zilog Z80), 65535 was the highest addressable memory location. Such processors thus supported at most 64 kibibytes (64 KiB) of total memory. Of course, this is assuming byte-addressed memory. In Internet protocols, 65535 is also the number of TCP and UDP ports available at an IP address, since port 0 is reserved.