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
 
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