Plan your network infrastructure. Enter an IP address and CIDR notation to see network details, broadcast address, and usable host range.
An IP subnet calculator determines network address, broadcast address, usable host range, and related subnet information from an IP address and prefix/CIDR.
For IPv4, the prefix length tells how many leading bits identify the network. The remaining bits identify hosts.
CIDR notation such as 192.168.1.0/24 represents an address with a 24-bit network prefix.
Subnet calculations depend on whether the address is IPv4 or IPv6 and on the addressing conventions used.
Use it for network planning, troubleshooting, address allocation, and checking whether two hosts are in the same subnet.
Common mistakes include confusing network and host bits, using the wrong prefix length, and forgetting reserved addresses in IPv4 networks.
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