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The first part (168.168.XXX.XXX in the example) indicates network address identifying the
network where the device resides. Network addresses are assigned by three allocation
organizations. Depending on your location, each allocation organization assigns a globally
unique network number to each network that wishes to connect to the Internet.
The second part (XXX.XXX.8.100 in the example) identifies the device within the network.
Assigning unique device numbers is your responsibility. If you are unsure of the IP addresses
allocated to you, consult the allocation organization from which your IP addresses were
obtained.
Remember that an address can be assigned to only one device on a network. If you connect to the
outside, you must change all the arbitrary IP addresses to comply with those you have been allocated
by the allocation organization. If you do not do this, your outside communications will not be
connected.
A subnet mask is a filtering system for IP addresses. It allows you to further subdivide your network.
You must use the proper subnet mask for a proper operation of a network with subnets defined.
