Parker Hannifin
What subnet mask to use depends on your network
configuration, and address class. Where the host ID appears in
the IP address, use a zero in the subnet mask. And where the
network ID and subnet ID appear, use 255 in the subnet mask.
Suppose on network 172.20.0.0 (class B) you have to set up a
new computer. You assign it 172.20.44.180 as the IP address. As a
class B network, the first two octets are reserved for the network
ID. The third octet is reserved for the subnet ID, and the last octet
is for the host ID. So using the subnet mask 255.255.255.0 identifies
the final octet as the host ID.
Appendix 171
