How to identify RFID tag type?

Identifying an RFID tag type usually involves checking a combination of frequency, protocol, chip type, and physical characteristics. Here's a clear and practical guide:

1. Identify by Frequency (Most Important First Step)

RFID tags are mainly divided into three frequency ranges:

LF (Low Frequency) - 125 kHz / 134.2 kHz

Short read range (a few cm)

Common in access control, animal tracking

Examples: EM4100, TK4100

HF (High Frequency) - 13.56 MHz

Read range: up to ~10–30 cm

Used in NFC, smart cards, ticketing

Standards: ISO14443, ISO15693

UHF (Ultra High Frequency) - 860–960 MHz

Long read range (meters)

Used in logistics, warehouse, asset tracking

Standards: EPC Gen2 (ISO18000-6C)

👉 Quick method: Use a multi-frequency RFID reader or test with known readers to see which one detects the tag.

2. Check the Protocol / Standard

Once you know the frequency, identify the protocol:

HF tags:

ISO14443 (e.g., MIFARE, NFC Type A/B)

ISO15693 (longer range HF, like ICODE SLIX)

UHF tags:

EPC Class 1 Gen2 (most common)

👉 Use a reader software or mobile app (like NFC tools) to read:

UID (unique ID)

Protocol type

Memory structure

3. Identify the Chip Type

The chip determines performance and compatibility.

Examples:

HF chips: NXP MIFARE Ultralight, NTAG213, ICODE SLIX

UHF chips: Impinj Monza R6, Alien Higgs-3

👉 Use:

RFID reader software

NFC phone apps (for HF/NFC tags)

These tools often directly show the chip model.

4. Check Memory Structure

Different tags have different memory layouts:

HF/NFC tags:

UID + user memory

Sometimes sectors/blocks (e.g., MIFARE Classic)

UHF tags:

EPC memory

TID (chip identifier)

User memory (optional)

👉 Reading memory banks helps confirm tag type.

5. Look at Physical Characteristics

Sometimes you can infer the type from appearance:

Thin label (sticker) → usually UHF or HF PET label

PCB / thick hard tag → often UHF anti-metal tag

Card (ISO size) → HF (MIFARE / NFC)

Small glass capsule → LF animal tag

6. Use Professional Tools (Most Accurate)

RFID handheld reader (UHF or HF)

Desktop reader + SDK software

NFC-enabled smartphone (for 13.56 MHz only)

These tools can:

Auto-detect protocol

Display chip manufacturer

Show memory banks

7. Check Tag Marking or Supplier Info

Some tags have:

Printed model numbers

Laser engraving

Datasheets from supplier

Practical Workflow (Recommended)

Try reading with:

NFC phone → if works → HF (13.56 MHz)

UHF reader → if works → UHF

Use reader software to get:

Protocol

Chip type

Confirm with memory structure + physical form

Quick Summary