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Why are 3 IP addresses in a CIDR block not usable for end station device addressing?

April 26, 2017ADDRESSING block cidr device ip addresses station usable

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10 Posted

Why are 3 IP addresses in a CIDR block not usable for end station device addressing?

2 Answers

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10 Posted

The first address in the IP assignment is the subnet address. It is used for routing tables only, and is NOT ASSIGNABLE to a device on your network. The second address in the IP assignment is assigned to your router interface. This address is the default gateway that instructs how your internal LAN needs to route traffic to the Internet. The last address in the IP assignment is the broadcast address for the subnet. It is NOT ASSIGNABLE to a device on your network. The remaining addresses are user-assignable. They can be used for devices on your network.

0

Posted

The first address in the IP assignment is the subnet address. It is used for routing tables only, and is NOT ASSIGNABLE to a device on your network. The second address in the IP assignment is assigned to your router interface. This address is the default gateway that instructs how your internal LAN needs to route traffic to the Internet. The last address in the IP assignment is the broadcast address for the subnet. It is NOT ASSIGNABLE to a device on your network. The remaining addresses are user-assignable. They can be used for devices on your network.