The subnet mask for a /25 network is 255.255.255.128. This corresponds to 25 bits allocated for the network portion of the IP address, leaving 7 bits for host addresses within each subnet. This subnet mask effectively divides the IP address space into smaller subnetworks, each capable of accommodating up to 126 usable IP addresses.
A /25 network allows for 128 subnets. This is derived from the formula 2^(32 – 25), where 32 represents the total number of bits in an IPv4 address. Each subnet has its own range of IP addresses and can be independently managed within the larger network infrastructure.
The network 255.255.254.0, or /23 in CIDR notation, defines a subnet mask that allows for a larger number of IP addresses within its range. Specifically, it covers IP addresses from 192.168.0.0 to 192.168.1.255. The subnet mask 255.255.254.0 effectively designates 23 bits for the network portion and 9 bits for host addresses, accommodating up to 510 usable IP addresses per subnet.
A /25 network provides for 126 usable IP addresses per subnet. This is because 32 – 25 = 7 bits are reserved for host addresses within each subnet, allowing for 2^7 – 2 IP addresses (minus two addresses reserved for network and broadcast) in each subnet. This allocation is typically used in scenarios where a moderate number of hosts need to be accommodated within numerous smaller subnets across a network infrastructure.