100PCS CUID Gen2 NFC IC Cards – 4-Byte UID Changeable, MCT

100PCS CUID GEN2 4 Byte UID Changeable IC Card Support Android App MCT Vue White

100PCS CUID Gen2 NFC IC Cards – 4-Byte UID Changeable, MCT

$90.99 $111.99

100-Pack CUID Gen2 4-Byte UID Changeable NFC IC Cards

Upgrade your NFC project or access-card setup with this bulk pack of 100 CUID Gen2 IC Cards. Each card features a fully re-writable 4-byte UID, making it fully compatible with Mifare Classic 1K readers. Modify the UID directly from any NFC-enabled Android device using the free MCT (Mifare Classic Tool) app — no proprietary hardware required.

⚠️ Important Notes:

Changing the UID via software on a keyfob is not the same process as changing it on a CUID keychain card. Please use the correct method for your card type.
Before use, confirm your Android phone has NFC capability and that NFC is enabled in settings.
To modify the UID, search for "MCT" in the Google Play Store on your Android device.

Key Features

Card Size: CR80 (standard credit card size)
Chip: CUID – fully compatible with Mifare Classic 1K
Memory: 1K
Working Frequency: 13.56 MHz (ISO 14443A)
Communication Rate: 106 KBaud
Read/Write Distance: 0–10 cm (varies by card reader)
Read/Write Time: 1–2 ms
Operating Temperature: -20°C to 85°C
Flash Write Cycles: 100,000+
Data Retention: 10+ years
Quantity: 100 cards per pack
Color: White

What's in the Box?

100 × CUID Gen2 4-Byte UID Changeable IC Cards (White)

Who Is This For?

These cards are ideal for developers, hobbyists, IT professionals, and security researchers who need a reliable bulk supply of re-programmable NFC cards for prototyping, testing, or deploying custom access-control systems. The CUID chip allows repeated UID changes without hardware cloners — just your NFC-capable Android phone.

For more information on NFC and RFID technology standards, visit the NIST Cybersecurity Resource Center.

Made in Mainland China.

Frequently Asked Questions

Q: Are these CUID Gen2 IC cards compatible with all Mifare Classic 1K readers?

A: Yes. The CUID Gen2 chip is fully compatible with Mifare Classic 1K readers operating at 13.56 MHz (ISO 14443A), making them suitable for a wide range of access control and NFC reader systems.

Q: How do I change the UID on these NFC cards using my Android phone?

A: Ensure your Android device has NFC capability and that NFC is turned on. Then download the free MCT (Mifare Classic Tool) app from the Google Play Store. Use the app to write and modify the UID on each card as needed.

Q: How many times can I rewrite the UID on each card?

A: Each card supports over 100,000 flash write cycles, making them highly durable for repeated UID changes during prototyping, testing, or long-term deployment.