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Patron Barcode Specifications

When setting up your patrons' barcodes for use with Aleph, the Office of Library services recommends the following specifications:

  • Barcode length: Most CUNY schools use a 14-digit barcode, but there are also 16- and 13-digit barcodes in use. The maximum length allowed is 20 digits.
  • Unique 5-digit prefix (beginning with '2') to identify your library.
  • Checksum digit

For a list of existing barcode prefixes in use at CUNY, please see Libraries > Barcode Prefixes. (You must be signed into the OLS Support Site to see the list.)