CIDR and Subnet Calculator
Enter an IPv4 CIDR block or an IP with a subnet mask to get the network address, broadcast address, subnet mask and usable host range.
Enter an IPv4 CIDR block or an IP with a subnet mask to get the network address, broadcast address, subnet mask and usable host range.
CIDR notation, like 192.168.1.0/24, describes a block of IP addresses. The number after the slash says how many leading bits belong to the network.
Enter a CIDR block, or an address with a subnet mask, to see the network and broadcast addresses, the mask, and the range of usable hosts.
192.168.1.77/24 Network 192.168.1.0 Broadcast 192.168.1.255 Hosts 192.168.1.1 - 192.168.1.254
The network and broadcast addresses are reserved, so a /24 has 256 addresses but 254 usable hosts.
A /31 has two usable addresses (point-to-point links) and a /32 is a single host.
No. This tool handles IPv4 only.
No. The calculation runs in your browser.