The subnet mask in AIX can be found using the ‘ifconfig’ command. This command will display the network configuration for all active network interfaces. The subnet mask will be listed next to the ‘netmask’ field. For example, the following output shows that the subnet mask for the ‘en0’ interface is 255.255.255.0:
# ifconfig en0 | grep netmasknetmask 255.255.255.0
The subnet mask is an important part of the network configuration. It is used to divide the network into smaller subnetworks. This allows multiple networks to share the same physical network infrastructure. The subnet mask also helps to determine which hosts are on the same network and which are on different networks.