Hawkynt

PLANET

PLANET (Postal Alpha Numeric Encoding Technique) check digit for US Postal Service Confirm Service. 12 or 14 digits for tracking business reply mail and other tracked mailings. Uses same modulo-10 algorithm as POSTNET but different barcode format.

Properties

Property	Value
Category	Checksums
Sub-category	Postal Tracking
Security status	🎓 Educational Only
Complexity	Beginner
Inventor	United States Postal Service
Year	1993
Origin	🇺🇸 United States
Source	`algorithms/checksum/planet-checksum.js`

Security

Status: 🎓 Educational Only

No vulnerabilities are recorded for this implementation.

Notes

Format: 12 or 14 digits + 1 check digit
Used for: Business reply mail, tracking
Algorithm: Same as POSTNET (sum mod 10)
Barcode: Height-encoded bars (different from POSTNET)
Service ID: 2 digits identifying mail class
Mailer ID: 6-8 digits
Sequence: 0-6 digits
Check digit: (10 - sum mod 10) mod 10
Used: 1993-2013
Superseded by: Intelligent Mail Barcode

Documentation

References

tc-lib-barcode PLANET implementation

Test vectors

3 vectors ship with this algorithm and run in the test suite. Byte values are hexadecimal.

Vector 1 — PLANET 12-digit

Field	Value
`input`	`313233343536373839303132`
`expected`	`02`

Vector 2 — PLANET 14-digit

Field	Value
`input`	`3132333435363738393031323334`
`expected`	`05`

Vector 3 — Simple sequence

Field	Value
`input`	`303030303030303030303030`
`expected`	`00`

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