426SEP 2004Ver. 1.2DP-1520P/1820P/1820E9.3.2. Subnet MaskA subnet mask defines how sub-segments of a network are treated.For network management purposes, special IP addresses are assigned.1. Host address is set to all “0”2. Host address is set to all “1”Reserved for IP broadcasting to all subnet stations.3. All 4 octets are set to all “1”IP broadcast of 255.255.255.255 can be passed over the router when the network address is specified.Normally, this is used for DHCP (Dynamic Host Configuration Protocol) network.4. All 4 octets are set to all “0”Reserved for default route for non-destination address5. Most significant bit starting with “127”Reserved for loop back address1IP192.168.32.1 1 0 0 0 0 0 0 1 0 1 0 1 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 11 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 01922552552551 1 0 0 0 0 0 0 1 0 1 0 1 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0Subnet Mask255.255.255.0NetworkAddress192.168.32.0IPSubnet MaskNetwork Address Configuration1683210190.0.3.1255.255.255.0 190.0.3.2255.255.255.0 190.0.3.3255.255.255.0190.0.2.1255.255.255.0 190.0.2.2255.255.255.0 190.0.2.3255.255.255.0190.0.1.1255.255.255.0 190.0.1.2255.255.255.0 190.0.1.3255.255.255.0GroundFloorSecondFloorThirdFloorRouterGlobal IPAddress190.0.0.0255.255.0.0NoteUpper: IP addressLower: Subnet maskClass B Subnet Outline
