SUBNET CALCULATOR

IPv4 CIDR subnet calculator. Network address, broadcast, usable hosts, subnet splitting. Essential for AWS VPCs, Kubernetes CNI, firewall rules, and Docker networks.

IP / CIDR NOTATION

About Subnet Calculator

Enter any IPv4 CIDR block (e.g. 10.0.0.0/8, 172.16.0.0/12, 192.168.1.0/24) to instantly get the network address, broadcast address, subnet mask, wildcard mask, and usable host range.

Subnet Splitter divides your CIDR block into equal subnets — useful for AWS VPC planning, Kubernetes node ranges, or firewall segmentation. All computation is purely client-side.