Network and Broadcast Calculations Made Easy with Simple Animations

Welcome to understanding IP addresses and subnet masks with Spark.E!An IP address is made up of four numbers, called octets, separated by dots.Each octet can be represented in binary format, using eight bits.A subnet mask, like 255.255.255.0, helps define which parts of the IP address belong to the network and which can be used for hosts.In binary, the subnet mask shows ones for network bits and zeros for host bits.Let's visualize how the subnet mask separates network and host portions.The green boxes represent the network portion, which must stay fixed for all devices on the same network.The red boxes show the host portion, which can be different for each device on the network.In this example, with a slash 24 subnet mask, the first three octets are fixed for the network, while the last octet can change for different hosts.To find the network address, we perform a bitwise AND operation between the IP address and subnet mask.Let's look at each octet in binary format. The IP address 192.168.1.50 becomes these binary numbers.When we perform the AND operation, a result bit is 1 only if both the IP and mask bits are 1.To find the broadcast address, we keep the network portion the same, but set all host bits to 1.In our example with a /24 network, the last octet becomes all ones, or 255.Let's compare our network and broadcast addresses side by side.Now that we have our network and broadcast addresses, we can determine the valid host range.Now that we have our network and broadcast addresses, we can determine the valid host range.The valid host range lies between the network address and broadcast address, excluding both boundaries.The first valid host address is always the network address plus one.And the last valid host address is always one less than the broadcast address.To calculate the total number of available hosts, we use the formula two to the power of n minus two, where n is the number of host bits.In a slash 24 network, we have 8 host bits, giving us 254 usable host addresses.These 8 host bits can be changed to create different host addresses within our valid range.This gives us a continuous range of valid host addresses from 192.168.1.1 to 192.168.1.254.For example, 192.168.1.100 is a valid host address because it falls within our valid range.