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DHCP Calculator

Calculate DHCP pool range and total leases from a subnet. Exclude reserved IPs and generate a ready-to-paste config.

Examples:

Related Tools

Subnet Calculator

Enter any IPv4 address and CIDR prefix or dotted subnet mask like 255.255.255.0. Network address, broadcast, host range, and wildcard mask calculate instantly. The built-in visual subnet calculator lets you split and rejoin blocks interactively.

VLAN Planner

Design your network segmentation - assign VLAN IDs, names, and subnets with live validation and CSV export.

Bandwidth Calculator

Convert network speeds between Mbps, Gbps, MB/s and more. Estimate file transfer time for any file size and link speed, and calculate link utilisation percentage.

About this tool

The DHCP Calculator computes the assignable IP range within any subnet and shows exactly how many leases are available. Enter a subnet in CIDR notation and optionally exclude gateway addresses, static reservations, or any range you want kept out of the pool. The network and broadcast addresses are always excluded automatically.

The config generator produces a ready-to-paste snippet for three common DHCP server platforms. ISC DHCP (used on Linux and many routers), MikroTik RouterOS, and Windows DHCP Server all use different syntax but the same underlying pool start, end, and lease time values computed from your input.