Have you found a different default credential for a specific ZKTeco model? Let me know in the comments—firmware variants matter.
For high-security environments, create a new administrator account and then the default admin user. This prevents brute-force attacks targeting the well-known username. zkteco web 30 default username and password link
Typically 192.168.1.201 or 192.168.1.234 Have you found a different default credential for