IPv4 Subnet Calculator
Calculate the network address, broadcast address, and usable host range for an IPv4 subnet.
Calculate
Enter your values below.
Result
Network address
0
Broadcast address
0
Usable host range
0
Usable hosts
0
Formula used
The subnet mask (derived from the prefix length) is applied to the IP to find the network address; the broadcast address is the last address in that range.
Example: 192.168.1.50/24 → network 192.168.1.0, broadcast 192.168.1.255, 254 usable hosts.
How to use this calculator
- Enter IP address, Subnet prefix length (/n).
- Press Calculate to see your result instantly.
FAQ
Frequently asked questions
What is a subnet prefix (/24)?
It indicates how many leading bits of the 32-bit address are the network portion — /24 means a 255.255.255.0 mask.
What is the network address used for?
It identifies the subnet itself and can't be assigned to a host.
What is the broadcast address?
The highest address in the subnet, used to send data to every host on that subnet.
Why are 2 addresses subtracted from the host count?
The network and broadcast addresses are reserved and can't be assigned to individual devices.