Machine-readable postal marking may refer to:
POSTNET, Postal Numeric Encoding Technique, which encodes ZIP codes, ZIP+4 codes and (optionally) delivery points Postal Alpha Numeric Encoding Technique, PLANET, barcode used by the U.S. Postal Service Facing Identification Mark, a bar code designed by the U.S. Postal Service Intelligent Mail barcode, replaces POSTNET and PLANET Identification Code Tracking