65535 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.
65535 is sometimes expressed as 2 16 -1 (two to the power of sixteen, minus one)
* 65535 is the limit for many player variables in video games, such as experience points in Dragon Warrior, maximum enchant of items in Lineage 2, money carried in Phantasy Star, score in Star Wars: TIE Fighter and stats in The 4th Coming.
* In Internet protocols, 65535 is also the number of TCP and UDP ports available at an IP address, since port 0 is reserved.
* Indices in chat groups may well max out at 65535.
* 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.
* A Java class or interface can have max. 65535 number of methods.
* In Microsoft Excel 2003 and lower, the maximum amount of rows one was allowed to use was 65535. In Microsoft Office 2007 this has been extended to 1,048,576 (or 220) rows.
* Also of note: In Microsoft Excel 2007, many (not all) mathematical computations evaluating to 65535 will display incorrectly. For example =850*77.1 displays as 100000 rather than 65535. Microsoft reports this to be a display-only bug for only 6 floating point numbers near 65535 and 6 near 65536.
i would like to add proccess id on OSPF can be up to 65535