Daily Use

IP Subnet Calculator

Calculate network subnets, broadcast addresses, and valid host ranges from an IP and CIDR mask.

Network Address
—
Broadcast Address
—
Usable Host Range
—
Total Usable Hosts
—
IP Class & Type
—
Wildcard Mask
—
How to Use
  1. Enter an IPv4 IP Address.
  2. Select the CIDR notation (e.g. /24) or manually type the Subnet Mask (e.g. 255.255.255.0).
  3. The calculator immediately determines the network boundaries, broadcast address, and exactly how many usable IPs are in that subnet.

Formula

Binary Math:
Network Address = IP AND Subnet Mask
Broadcast = Network OR Wildcard Mask
Wildcard = NOT Subnet Mask
Usable Hosts = 2(32 - CIDR) - 2

An IP Subnet Calculator is essential for network administrators to design and troubleshoot routing. It converts CIDR notation into dotted decimal masks, extracts the root network ID, and calculates the exact range of assignable host IP addresses for any subnet.