Goodbye Classful Addressing, Hello Subnetting!

Goodbye Classful Addressing, Hello Subnetting!

In the world of network addressing, classful addressing is no longer the go-to method for IPv4 networks. It has been replaced with subnetting, a more efficient and customizable approach to assigning IP addresses. In this blog post, we'll discuss the differences between classful addressing and subnetting and how subnetting makes managing IP addresses easier and more efficient.

What is Classful Addressing?

IPv4 classful addressing is a system of network addressing wherein network classes are assigned an IP address range. Each class has a different range, and each range is divided into blocks. For instance, Class A addresses are for networks with large numbers of hosts and have a range from 0.0.0.0 to 127.255.255.255. Class B addresses are for medium-sized networks with a range from 128.0.0.0 to 191.255.255.255. Class C addresses are for small networks with a range from 192.0.0.0 to 223.255.255.255. Class D and E addresses are used for multicast and experimental purposes, respectively.

Classful addressing requires that all addresses in the same network share the same network prefix, and each address must fall within the range of the class it belongs to. This means that all hosts on a Class A network will have the same first octet (the first 8 bits of the IP address). This can be problematic for larger networks since it limits the number of IP addresses that can be assigned. It also means that all hosts on the same network must have the same amount of address space.

What is Subnetting?

In ipv4 addresses classful addressing is replaced with subnetting, a more efficient method of address assignment. Subnetting is a process of dividing the network into smaller networks, or subnets. Each subnet has its own address range, which is determined by a subnet mask. The subnet mask determines which bits of the IP address make up the network part of the address and which bits make up the host part of the address. By changing the subnet mask, the size of the subnet can be adjusted, allowing more IP addresses to be assigned to the network.

Subnetting is more efficient than classful addressing in that it allows a single network to be divided into multiple subnets, each with its own IP address range. This allows more IP addresses to be assigned to a single network, as well as allowing for more efficient routing between subnets. Subnetting also allows for more segmentation of the network, allowing for better security and control over network traffic.

Advantages of Subnetting

Subnetting offers several advantages over classful addressing. First, it allows for more efficient routing between subnets. Since each subnet has its own address range, traffic can be routed to the appropriate subnet without having to traverse the entire network. This can reduce the amount of traffic on the network, as well as improve performance. Second, it allows for better segmentation of the network, allowing for better security and control over network traffic.

  • Networking