About CIDR
CIDR (Classless Inter-Domain Routing) is a method for allocating IP addresses and routing Internet Protocol packets. It allows for more efficient allocation of IP addresses than the older class-based system.
CIDR Tips
- /24: 256 addresses (254 usable), common for small networks
- /16: 65,536 addresses, common for medium networks
- /8: 16,777,216 addresses, large network blocks
- Private Ranges: 10.0.0.0/8, 172.16.0.0/12, 192.168.0.0/16
- Host Bits: 32 - prefix length = number of host bits
- Usable Hosts: Total hosts - 2 (network & broadcast)