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IP address calculator
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About this tool
Calculate an IPv4 subnet mask, network, broadcast address and usable host range from CIDR.
Common uses
- Calculate an IPv4 subnet mask, network, broadcast address and usable host range from CIDR.
- Enter an IPv4 address with prefix length, such as 192.168.1.10/24.
How to use it
- 1.Enter an IPv4 address with prefix length, such as 192.168.1.10/24.
- 2.Read the calculated network and host counts, then copy the summary.
Worked example
Input and result
192.168.1.10/24
Network: 192.168.1.0; broadcast: 192.168.1.255; usable hosts: 254
The /24 result excludes network and broadcast from its usable-host count.
Limits and notes
- Requires octets 0–255 and prefix /0–/32. For /31 and /32 all addresses count as usable; no network scanning occurs.
Frequently asked questions
What does this tool do?
Calculate an IPv4 subnet mask, network, broadcast address and usable host range from CIDR.
What should I check before using the result?
Requires octets 0–255 and prefix /0–/32. For /31 and /32 all addresses count as usable; no network scanning occurs.