PLANET WGSW-52040 - Manual (Page 12)

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For example, the IP address of the Managed Switch is configured with
192.168.1.254, then the manager PC should be set at 192.168.1.x (where x
is a number between 1 and 253, except 254), and the default subnet mask is
255.255.255.0.
The factory default user name and password are as follows:
Username: admin
Password: admin