UID Analyzer
Inspect a 4 / 7 / 10-byte ISO/IEC 14443 Type A UID. Identifies cascade level, manufacturer ID, and whether the UID is fixed (unique) or random (RID).
Input
Decoded
Paste hex to decode.
All decoding runs locally.
About UIDs
An ISO/IEC 14443 Type A UID is a 4-, 7-, or 10-byte identifier emitted during anti-collision. Modern cards use 7 bytes with the first byte as the manufacturer ID. The 4-byte form is legacy MIFARE Classic; cards using a leading 0x08 on a 4-byte UID are emitting a random ID (RID, also called nUID), re-randomised per power cycle. UIDs are not secrets — they are visible to any reader within RF range; security architectures must never rely on UID confidentiality.