Subnet Calculator (IPv4 CIDR)
Free IPv4 subnet calculator. Enter an IP and CIDR prefix to get the network, broadcast, usable host range, subnet mask and host count.
Cloud tip
Cloud providers usually reserve a few addresses in every subnet (often 5), so your real usable count is slightly lower than the classic number. Plan VPC ranges that don't overlap with on-premises or other cloud networks if you'll ever connect them. See Enterprise Cloud Networking Explained.
Free tools are provided as-is for general information; verify results before relying on them. Content on this site is for general information and education only and is not professional advice. This site contains ads and affiliate links; we may earn a commission at no extra cost to you.