| Network address | 192.168.1.0 |
| Broadcast address | 192.168.1.255 |
| Subnet mask | 255.255.255.0 |
| Wildcard mask | 0.0.0.255 |
| First usable host | 192.168.1.1 |
| Last usable host | 192.168.1.254 |
| Total addresses | 256 |
| Usable hosts | 254 |
| CIDR | /24 |
IPv4 subnet math computed entirely in your browser — nothing is uploaded.
Calculate IPv4 subnets from CIDR, free. CIDR notation (RFC 4632) writes an IPv4 network as an address plus a prefix length, like 192.168.1.0/24. This calculator expands a CIDR block into its network address, subnet mask, broadcast address, usable host range and host count — entirely in your browser.
It expands an IPv4 CIDR block into network, mask, broadcast, host range and usable-host count, so you can plan and verify addressing without manual binary math. 100% free, no registration, and complete privacy — everything runs locally in your browser, so your data never touches a server.
Enter a CIDR like 10.0.0.0/24 and get network address, mask, broadcast, first/last host and total usable hosts.
The tool does the bitwise math for you, so you don't have to convert masks and addresses to binary.
Calculation runs locally in your browser; nothing you enter is uploaded or stored.
Unlimited calculations with no account, on desktop and mobile.
Enter an IPv4 address with a prefix (e.g. 192.168.1.0/24). The tool applies the prefix as a mask to derive the network, broadcast, mask, host range, and number of usable hosts.
A /24 has 256 total addresses, but the network and broadcast addresses are reserved, leaving 254 usable hosts. In general a /n has 2^(32-n) addresses and 2^(32-n) − 2 usable hosts (for n ≤ 30).
The network address is the first address in the block (all host bits 0) and identifies the subnet; the broadcast address is the last (all host bits 1) and reaches every host. Neither is assigned to a device.
No. The calculation happens entirely in your browser; nothing you enter leaves your device.
Yes. /32 is a single host (used for routes/loopbacks) and /31 is a 2-address point-to-point link (RFC 3021) with no separate broadcast — the calculator handles these edge cases.