Netmask Calculator

Tech Calculators

Calculate netmask and bits from a host count requirement.

/26
Prefix
255.255.255.192
Subnet Mask

About This Tool

Determine the required subnet mask and CIDR prefix based on the number of hosts you need for your network.

Frequently Asked Questions

One address is reserved for the Network ID and another for the Broadcast address.

In modern networking (RFC 3021), /31 can be used for point-to-point links with 2 usable IPs.

A /24 subnet (255.255.255.0) provides exactly 254 usable host addresses.

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