IPv4 Calculator
Enter an IPv4 address and CIDR prefix to get the network address, broadcast address, usable host range, subnet mask, wildcard mask and total number of hosts. A must-have for network engineers.
It is completely free, private and requires no signup.
The prefix tells you how many bits are network vs host.
Network and broadcast addresses are never usable by hosts.
Leave headroom when dividing subnets for future devices.
How it works
Enter an IPv4 address and CIDR prefix to get the network address, broadcast address, usable host range, subnet mask, wildcard mask and total number of hosts. A must-have for network engineers.
Type an IPv4 address and a CIDR prefix (e.g. 192.168.1.0/24).
All network details are computed instantly.
Examples & Data
| CIDR | Hosts | Usable |
|---|---|---|
| /24 | 256 | 254 |
| /25 | 128 | 126 |
| /26 | 64 | 62 |
| /30 | 4 | 2 |
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It is completely free, private and requires no signup.
Use the tool nowFrequently Asked Questions
It is the number of network bits, from /0 to /32. /24 means the first 24 bits identify the network.
2^(32-prefix) minus 2 — subtracting the network and broadcast addresses.
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