Subnet Manager
Calculate and manage IPv4 and IPv6 subnets. Add multiple subnets to detect overlaps and plan your IP address space. All computation happens in your browser — nothing is sent to any server.
With CIDR:
10.0.0.0/16 · Without: 10.0.0.0 · Empty = discoveryEmpty network → Supernet Discovery mode
Hosts:
500,300,100 · Prefixes: /24,/25,/26 · Masks: 255.255.255.0