That is almost like asking how many digits are in a number. The only limit is the amount of space available for a barcode. Even the size of most scanners does not create an absolute limit because there are barcode readers that look like a pen and read the barcode information serially (one digit at a time).
Perhaps you would like to rephrase your question to find out about a particular barcode application. For example, Universal Product Codes (UPC's) usually have ten digits. The first five identify the manufacturer or distributor, and the other five identify a unique product, including a particular size or quantity of the product. UPC's do not contain any price information; that information is cross referenced by the store's computer after the UPC is scanned.
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0000,0001,0010,0011,0100,0101,0110,0111,1011,1100,1101,1110
first 3 nos denote the college code... Next 2 digits the batch ( it says the last 2 digits of the starting year eg: if a batch is 2001 - 2005 then code is 01, if it is 2002 - 2006 then code is 02) Next 3 digits denote the department code... next 3 digit your roll no in ur class (alphabetic order during te registration time then the new students will be addedd last )...
10 bits would be required. 10 bits long (10 digits long) can represent up to 1024.
5
Only 1 exists, and it is "999"