Subnet/CIDR Calculator
Enter an IP address and subnet mask to instantly view network address, broadcast, host range, wildcard mask, and total usable hosts.
AdEnter a valid IPv4 address (e.g. 192.168.1.0).
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Subnet Details
/24
CIDR
254
Usable Hosts
256
Total Addresses
Calculated Results
Network Address192.168.1.0
Broadcast Address192.168.1.255
First Usable Host192.168.1.1
Last Usable Host192.168.1.254
Subnet Mask255.255.255.0
Wildcard Mask0.0.0.255
Binary Mask11111111.11111111.11111111.00000000
Documentation
How It Works
Enter an IPv4 address and select a CIDR prefix length. The calculator performs bitwise AND between the IP and subnet mask to find the Network Address, and OR with the wildcard mask to find the Broadcast Address.
Usable host addresses are all IPs between the network and broadcast addresses, exclusive (except for /31 point-to-point and /32 host routes).
Key Formulas
Network: IP AND Subnet Mask
Broadcast: Network OR Wildcard Mask
Wildcard: NOT Subnet Mask (bitwise inverse)
Usable Hosts: 2^(32 - CIDR) - 2
Last Updated: February 2026
Note: This calculator supports IPv4 only.
Frequently Asked Questions
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