DFI EL331-RM - Manual (Page 162)

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Intel AMT Settings
Intel(R) Management Engine BIOS Extension v5.0.5.0010
Copyright(C) 2003-08 Intel Corporation. All Rights Reserved.
[ESC] : Exit [ENTER] : Submit
[ INTEL(R) AMT CONFIGURATION ]
29. Enter the subnet mask then press Enter.
Subnet mask (e.g. 255.255.255.0)
Host Name
TCP/IP
Provision Model
Setup and Configuration 
Un-Provision
SOL/IDE-R
Password Policy
Secure Firmware Update
255.255.255.0