🌐 Network Tool

IP Address Calculator

Calculate CIDR ranges, subnet masks, network & broadcast addresses and usable hosts instantly.

⊞ Subnet Planner ⊟ Cheat Sheet ⊙ Guide
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IP Address / CIDR

Invalid IP address format
/0/8/16/24/32
/24
Invalid prefix or mask
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Quick Presets

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Enter an IP and CIDR
Results appear here

⊞ Subnet Planner (VLSM)

Enter a base network and your subnet requirements. The planner allocates optimally-sized blocks using Variable Length Subnet Masking.

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Base Network

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Subnet Requirements

Subnet name + minimum hosts needed
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Configure and click Plan Subnets
VLSM allocation appears here

⊟ Subnet Cheat Sheet

Quick reference for CIDR ranges, masks, private ranges, formulas and special addresses.

⊙ IP Networking Guide

Learn IP addressing, CIDR notation, subnetting, subnet masks, private ranges and more.

Jump to: IP Basics CIDR Subnetting Masks Private Ranges Special Addresses Examples