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AN10927

MIFARE and handling of UIDs

Rev. 3.1 — 02 October 2013

190731

Application note

COMPANY PUBLIC

Document information

Info

Content

Keywords

Single Size UID, Double Size UID, 4 Byte UID, 7 Byte UID, SNR, NUID,

FNUID, ONUID

Abstract

This document shows the use of UIDs in contactless smartcard systems.

It indicates recommendations about the Random ID, mixed use of 4 byte

and 7 byte UIDs in the same system, and it describes the options how to

upgrade 4 byte UID systems to accept 7 byte UID smart cards.

NXP Semiconductors

AN10927

MIFARE and handling of UIDs

AN10927

All information provided in this document is subject to legal disclaimers.

Application note

COMPANY PUBLIC

Rev. 3.1 — 02 October 2013

190731

3 of 21

1. Introduction

This document shows the use of UIDs in contactless smartcard systems. It indicates

recommendations about the use of Random ID, the mixed use of 4 byte (single size) and

7 byte (double size) UIDs in the same system, and it describes the options how to

upgrade 4 byte UID systems to use 7 byte UID smart cards.

Note: A UID is not a “serial number”, but a unique identifier. There is no recommendation

how to turn the array of bytes into an integer.

Note: “UID” is a common expression, defined in the ISO/IEC 14443-3. In some case the

UID is even not unique (like RID or NUID, see below).

Note: The 4 byte UID is called “Single Size UID”, too. The 7 byte UID is called “Double

Size UID”, too. The 10 byte UID is called “Triple Size UID”, too.

2. MIFARE and ISO/IEC 14443 UIDs

In this section the use of UIDs according to the ISO/IEC 14443 is described. Fig 1 shows

the three different UID sizes defined in ISO/IEC 14443-3 as they are used during the

anti-collision and selection procedure.

UID0 UID1 UID2 UID3

UID0 UID1

UID2 UID3CT UID4

UID5 UID6

UID3 UID4 UID5

UID6

UID7 UID8 UID9

4 byte UID

7 byte UID

10 byte UID

Cascade Level 1 Cascade Level 2

Cascade Level 3

BCC

BCCBCC

UID0

UID1 UID2CT BCC BCC BCC

(1) BCC = Block Check Character, it is calculated as exclusive-or over the 4 previous bytes.

(2) CT = Cascade Tag, to indicate a following cascade level.

Fig 1. UIDs according to ISO/IEC 14443

Fig 2 shows the Anticollision sequence, which is a mandatory part of the card activation

sequence. It automatically selects a single PICC with 4 byte UID (= Single Size UID),

7 byte UID (= Double Size UID) or 10 byte UID (= Triple Size UID).

Cascade Level 1

In the Cascade Level 1 the PCD sends the Anticollision command CL1 (0x93) and the

PICC returns

• either the 4 byte UID (UID0...UID4) and one byte BCC,

• or a Cascade Tag (CT) followed by the first 3 byte of the UID (UID0...UID2) and one

byte BCC.

The CT (0x88) indicates that the UID is not yet complete, and another Cascade Level

has to follow.

NXP Semiconductors

AN10927

MIFARE and handling of UIDs

AN10927

All information provided in this document is subject to legal disclaimers.

Application note

COMPANY PUBLIC

Rev. 3.1 — 02 October 2013

190731

5 of 21

− whether the card supports T=CL.

Cascade Level 3

If the UID is not yet complete, the PCD continues with an Anticollision CL3 command

(0x97), and the PICC returns

• the last 4 bytes of the Triple Size UID (UID6...UID9) and one byte BCC.

The CL3 then must be selected, using the Select command CL3 (0x97). The PICC

returns its SAK CL3, which indicates

• the type of card (refer to [1] and [2]), and

• whether the card supports T=CL.

2.1 Single Size UID

The single size UID contains 4 bytes. As shown in Table 1, the value of the UID0 byte

defines how those 4 bytes shall be interpreted.

Table 1. Assignment of Single Size UIDs

POR = Power on reset

UID0 [Hex]

Definition

Range

RID: UID1, UID2 and UID3 are dynamically generated

during or after each Power-On-Reset (POR).

appr. 16 million

x0... x7

Proprietary use (i.e. used for MIFARE)

appr. 2.1 billion

18…78, 98…E8

Proprietary use (i.e. used for MIFARE)

appr. 218 million

x9...xE

Proprietary use (i.e. used for MIFARE)

appr. 1.6 billion

Fixed number, non-unique

appr. 268 million

Cascade Tag

RFU

Note: Single Size UIDs do not have a manufacturer code.

Note: The use of Single Size UIDs (unique ones) might end soon, since the number of

usable IDs is limited to approximately 3.7 billion pieces only.

2.1.1 Random ID (RID)

A single size UID with UID0 = 0x08 indicates a Random Identifier. The Random ID (RID)

is dynamically generated, when the PICC powers up. Deselecting a PICC does not reset

the RID, but a field reset does.

Note: RID is always limited to 4 bytes.

Note: Depending on the PICC implementation, a UID (i.e. Double Size UID) may be

retrieved from the card by proprietary means after the PICC is selected with its RID.

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wxlainiyy

2018-12-25

资料不错，非常好，帮助非常大
阿杰与西门吹雪

2018-12-17

对学习mifare卡处理7字节的方式很有用处，不错的资料。
qq_23335927

2020-08-11

好东西啊啊啊啊
newdible

2014-09-29

非常有用的资料，谢谢分享。目前正在研究mifare1系统如何处理7字节的UID问题

onlineit

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