IP Subnet Calculator
CIDR → network, range, mask & hosts.
Runs entirely in your browser — nothing you enter is uploaded, logged, or tracked.
Enter an IPv4 address with a CIDR prefix (e.g. 192.168.1.10/24) to get the network and broadcast addresses, the usable host range, the subnet and wildcard masks, and the total host count.
Network
—Broadcast
—Host range
—Subnet mask
—Wildcard
—Usable hosts
—Frequently asked questions
What does the /24 mean?
The CIDR prefix is how many leading bits are the network portion. /24 means the first 24 bits are fixed (a 255.255.255.0 mask), leaving 8 bits — 256 addresses, 254 usable hosts.
Does it support any prefix?
Yes — prefixes /0 through /32, with the network, broadcast, mask, wildcard, host range, and counts recalculated instantly.