IP Subnet CIDR Hosts Available Calculator

Calculate usable host addresses from a CIDR prefix. Hosts = 2^(32-prefix) - 2 (subtract network and broadcast addresses). /24 = 254 hosts; /16 = 65,534 hosts.

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IP Subnet Calculator

IP Address
CIDR Prefix
/
Network
192.168.1.0
Broadcast
192.168.1.255
Subnet Mask
255.255.255.0
First Host
192.168.1.1
Last Host
192.168.1.254
Usable Hosts
254
Binary breakdown:
IP: 11000000.10101000.00000001.00000000
Mask: 11111111.11111111.11111111.00000000
Net: 11000000.10101000.00000001.00000000
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How It Works

Calculate usable host addresses from a CIDR prefix. Hosts = 2^(32-prefix) - 2 (subtract network and broadcast addresses). /24 = 254 hosts; /16 = 65,534 hosts

Each component has a specific meaning:

  • CIDR prefix — The cidr prefix recorded for the scenario being assessed.

Note: Interpret the subnet hosts (cidr) result against the thresholds and context described above.

How to Use

Enter the CIDR prefix for the scenario you are assessing. Calculate usable host addresses from a CIDR prefix. Hosts = 2^(32-prefix) - 2 (subtract network and broadcast addresses). /24 = 254 hosts; /16 = 65,534 hosts. Use the subnet hosts (cidr) result to inform your calculation.

Frequently Asked Questions