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Subnet / CIDR Calculator

Find usable hosts, broadcast address, and subnet details.

CALCULATE

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Formulas

Hosts = 2^(32 - CIDR) - 2

/24 = 254 hosts. /16 = 65,534 hosts. /8 = 16,777,214 hosts.

Subnet Basics

/32: single host. /31: point-to-point. /30: 2 hosts. /24: 254 hosts (most common LAN). /16: 65,534 hosts. /8: 16.7M hosts. Subtract 2 for network and broadcast addresses.

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