IPv4 Subnet Host Count Calculator
Determine how many usable addresses a subnet provides from its CIDR prefix length.
Assumes standard IPv4 addressing.
Examples
- /24 ⇒ 254 hosts
- /16 ⇒ 65534 hosts
FAQ
Why subtract 2?
Network and broadcast addresses are reserved.
Prefixes over 30?
They leave too few usable addresses.
Additional Information
- Result unit: hosts