Networking TOOL
Subnet Calculator
Calculate IPv4 network ranges, subnet masks, broadcast addresses and usable hosts.
When to use this tool
Plan a subnet before creating a VLAN, DHCP scope, route or firewall object.
Use it in three steps
- Enter an IPv4 address and CIDR prefix, then review the calculated network and usable address range.
- Review the calculated values against your environment and its requirements.
- Copy or document the result only after validating it for production use.