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# CIDR (Classless Interdomain Routing)

• Provides additional ways of arranging network and host info in an IP address
• Takes network ID and host's IP address and follows it with a forward slash followed by the number of bits used for a network ID
• E.g. 192.168.89.127/24
• 24 represents the number of 1s in the subnet mask
• Number of bits in the network ID
• Known as a CIDR block