Hawkynt

ICCID

ICCID (Integrated Circuit Card Identifier) check digit for SIM cards using Luhn algorithm. 18-20 digit identifier per ITU-T E.118 standard. Format: 89 (telecom) + CC (country) + issuer + account + check digit. Used in GSM, UMTS, LTE SIM cards worldwide.

Properties

Property	Value
Category	Checksums
Sub-category	Telecom Identifier
Security status	🎓 Educational Only
Complexity	Beginner
Inventor	ITU-T (International Telecommunication Union)
Year	1998
Origin	Not specified
Source	algorithms/checksum/iccid-checksum.js

Security

Status: 🎓 Educational Only

No vulnerabilities are recorded for this implementation.

Notes

• Format: 89 CC II… (18-20 digits)
• 89: Major industry identifier (Telecom)
• CC: Country code (ISO 3166-1 numeric)
• II: Issuer identifier
• Account/serial number + check digit
• Algorithm: Luhn (same as credit cards)
• Usually printed on SIM card
• Command: AT+CCID or AT+ICCID
• Example: 89014103211234567890
• Detects: All single-digit errors

Documentation

• ICCID on Wikipedia
• ITU-T E.118
• SIM Card Numbering

References

• python-stdnum Luhn implementation (used for ICCID check digit)

Test vectors

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

Vector 1 — Official ICCID 89148000005339755555

Field	Value
input	38393134383030303030353333393735353535
expected	05

Vector 2 — US AT&T ICCID pattern

Field	Value
input	38393031343130313233343536373839303132
expected	02

Vector 3 — DE Vodafone ICCID pattern

Field	Value
input	38393439313031323334353637383930313233
expected	02

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