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Subnet Calculator
Enter an IP address and CIDR/subnet mask — get the network address, broadcast address, usable host range and total hosts instantly.
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Input
Result
Network Address—
Broadcast Address—
Subnet Mask—
Wildcard Mask—
Usable Host Range—
Total Hosts—
Usable Hosts—
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How to use — Subnet Calculator
- Enter an IP address (e.g. 192.168.1.0) and choose the CIDR/subnet mask.
- Get the network address, broadcast address, usable host range, and total hosts instantly.
FAQ
What is CIDR notation?
Notation like /24 indicates how many bits are reserved for the network. /24 equals a 255.255.255.0 subnet mask, which has 256 addresses (254 usable).
Why are the network and broadcast addresses separate from the usable range?
Each subnet's first address (network address) identifies the subnet, and the last (broadcast) is reserved for sending messages to everyone — neither can be assigned to devices.
Why is this useful for networking students/sysadmins?
Manual subnetting is error-prone — this tool gives correct values instantly for IP planning, VLAN setup, or exam prep (certifications like CCNA).
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