If your deployment utilizes ZKAccess, BioTime, or standard SDK connections over port 4370 (UDP/TCP), Telnet is completely unnecessary for daily operations. You can disable it by modifying the startup initialization scripts:
Ensure your PC is on the same subnet as the ZMM220 board (standard default IP is often 192.168.1.201 Terminal Client: Use a client like or the native Windows command prompt. telnet [Device_IP] telnet 192.168.1.201 Enter the credentials provided above. Important Notes Case Sensitivity: Credentials like are strictly lowercase.
For developers and security researchers, there are legitimate ways to interact with the ZMM220 besides the official software. The Python library is designed as a driver for ZKTeco biometric machines, with specific support for models like the ZMM220_TFT . This library allows for programmatic interaction with the device for tasks such as data extraction and integration into custom applications.
The security world has a name for the attack that exploits default credentials: the "Default Password Login attack." Threat actors constantly scan the internet for open Telnet ports and try to log in using lists of common default usernames and passwords. zmm220 default telnet password
Ensure your device is connected to the network and find its IP address (often found under System Menu > Communication > IP Address on the device screen).
If colorkey or solokey do not work, the password may have been changed, or the device may be using a newer firmware version that forces a password change upon first login.
The ZMM220 is a widely utilized core hardware platform developed by ZKTeco, found in numerous biometric access control terminals, time attendance clocks, and face recognition devices. For network administrators, system integrators, and security professionals, managing these devices often requires low-level command-line access via Telnet. If your deployment utilizes ZKAccess, BioTime, or standard
The telnet service might be disabled by default. You may need to enable "Developer Options" or "Telnet" in the firmware menu if available.
For secure remote access, it's recommended to use protocols like SSH (Secure Shell), which encrypts data during transmission. If telnet is used, consider the following:
This is the most pressing question for IT administrators and security professionals alike. The short answer is: This library allows for programmatic interaction with the
ZMM220 v2.4.3 Bootloader Enter password:
Security research and community findings suggest several credential sets that the manufacturer has historically used for Telnet access across ZMM220-based platforms: / Password:
What is the of the device (e.g., iClock 880, F18, MB20)?
To unlock the physical device menu, the default PIN is typically 1234 or 8888 . Troubleshooting Access