Ip Calculator
Calculate network details like network address, broadcast address, usable hosts, and subnet mask from an IP address and CIDR prefix.
Published by:
isCalculator Editorial Team
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How to use this tool?
How to Use the IP Calculator
This calculator computes network details from an IPv4 address and CIDR prefix. Follow these steps:
- Enter an IPv4 address in the IP Address field (e.g.,
192.168.1.0). Must be four octets (0–255). - Enter a CIDR prefix (0–32) in the CIDR Prefix field (e.g.,
24for a /24 subnet). - Click Calculate or press Enter in either input field.
Results shown:
- Network Address – first IP of the subnet.
- Broadcast Address – last IP of the subnet.
- Subnet Mask – dotted decimal mask (e.g.,
255.255.255.0). - Usable Hosts – number of assignable IPs (excludes network and broadcast, except /31 and /32).
- Formula – brief explanation of the calculation.
Note: Invalid IPs or CIDR values show red error messages. All inputs must be valid to get results.
Previous Results
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Frequently Asked Questions
An IP calculator computes network details like network address, broadcast address, subnet mask, and number of usable hosts from an IP address and CIDR prefix.
Enter a valid IPv4 address (e.g., 192.168.1.0) and a CIDR prefix (e.g., 24), then click Calculate. The results will show network address, broadcast address, subnet mask, and usable hosts.
CIDR prefix must be between 0 and 32 inclusive. Common values are 24, 16, and 8.
