Cidr Classless
- , by Stephanie Burrell
- 1 min reading time
CIDR, or Classless Inter-Domain Routing, is a method used in IP addressing that allows for more efficient allocation of IP addresses and better utilization of available address space. CIDR replaces the older classful addressing scheme that divided IP addresses into classes based on their leading bits.
In the classful addressing scheme, IP addresses were divided into five classes: A, B, C, D, and E. Each class had a fixed number of network bits and host bits, which limited the number of available IP addresses in each class. This led to inefficiencies in address allocation, as organizations often received more IP addresses than they actually needed.
CIDR, on the other hand, allows for a more flexible allocation of IP addresses by allowing networks to be divided into smaller subnets. This is achieved by using a subnet mask, which specifies the number of network bits in an IP address. For example, a subnet mask of /24 indicates that the first 24 bits of the IP address are used for the network portion, while the remaining 8 bits are used for host addresses.
CIDR also allows for more efficient routing of IP packets by aggregating multiple smaller networks into a single larger network. This reduces the size of routing tables and improves network performance.
In conclusion, CIDR is a more efficient and flexible method of IP addressing that allows for better utilization of available address space and more efficient routing of IP packets. By using CIDR, organizations can allocate IP addresses more effectively and improve the overall performance of their networks.
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