![]() ![]() If your business has 1,000 devices that connect to the internet, you would need a class B but would be wasting IP addresses because of the limitation of the class system. In class-based routing, each class has a specific number of hosts that can connect to a network:Ĭlass A for networks containing over 65,536 hostsĬlass B for networks containing 256 to 65,534 hostsĬlass C for networks containing less than 254 hosts Let’s take a closer look at how a subnet mask is used to break down classes in CIDR. Read more: Information Technology (IT) Terms: A to Z Glossary This process is subnetting and is done by a network systems administrator. With the introduction of CIDR in 1993, subnet masks broke down networks further so that IP addresses could be more efficiently created without wasting network space for entities that don’t need large quantities of host numbers. In class-based routing, there are a fixed amount of hosts and the number of the IP address. The subnet mask for each class is defined here: Class-based routing breaks down like this:Ĭlass A network prefix: 8 bits, host number: 24 bitsĬlass B network prefix: 16 bits, host number: 16 bitsĬlass C network prefix: 24 bits, host number: 8 bits Before the use of CIDR (Classless Inter-Domain Routing) in 1993, there were only three subnet masks used with the three main IP (IPv4) address classes. In an IP address, a subnet mask is a number structured like an IP address that shows the start of the host number in the IP address. ![]() Every IP address has a network prefix and a host number. ![]() A subnet mask seperates large networks into smaller subnets. ![]()
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