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subnet-calculator

Calculate IPv4 and IPv6 subnet details with CIDR breakdown and VLSM planning.

627|175|Updated Feb 19, 2026
Search Tags:#ipv6#ip-addressing#cidr#subnetting#ipv4#network-calculator
One-click install
npx skills add https://github.com/automateyournetwork/netclaw --skill subnet-calculator
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: subnet-calculator
Source: https://github.com/automateyournetwork/netclaw/tree/main/workspace/skills/subnet-calculator
Command: npx skills add https://github.com/automateyournetwork/netclaw --skill subnet-calculator

SYSTEM DOCUMENTATION & REQUIREMENTS

💡 This Skill includes scripts (resource) components.

What problem does it solve?

This Skill automates the complex calculations involved in IPv4 and IPv6 subnetting, eliminating manual errors and saving time for network engineers.

Core Features & Use Cases

  • CIDR Breakdown: Provides detailed information for any given IPv4 or IPv6 CIDR block.
  • Host Calculations: Determines the number of usable hosts, usable host ranges, and neighboring subnets.
  • Address Classification: Identifies private, global, multicast, and other address types.
  • VLSM Planning: Assists in designing efficient IP address allocation for Variable Length Subnet Masks.
  • Dual-Stack Analysis: Supports analysis for both IPv4 and IPv6 in mixed environments.
  • Use Case: Quickly determine the correct subnet mask and usable IP addresses for a new network segment or verify existing configurations.

Quick Start

Calculate the details for the IPv4 subnet 192.168.1.0/24.

Frequently Asked Questions about subnet-calculator

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
How do I calculate usable host ranges and subnet masks for an IPv4 CIDR block?▼

To calculate usable host ranges for an IPv4 CIDR block, input the network address with its prefix length. The calculator outputs the subnet mask, usable host counts, and available IP ranges.

Can I use this subnet calculator for IPv6 address classification and breakdown?▼

Yes, you can use this subnet calculator for IPv6 address breakdown. It features auto-detection of the IP version and identifies specific IPv6 address types like global addresses while providing detailed subnet information.

What is VLSM planning and how does a network calculator assist with IP address allocation?▼

VLSM planning involves assigning subnet masks of varying lengths to conserve IP addresses. The calculator assists by providing detailed CIDR breakdowns and usable host counts to design efficient Variable Length Subnet Mask allocations.

Does this IP subnetting tool support dual-stack environments with mixed IPv4 and IPv6 networks?▼

Yes, this IP subnetting tool supports dual-stack analysis for mixed environments. It provides auto-detection for both IPv4 and IPv6 inputs, allowing you to analyze and verify configurations for both protocols simultaneously.

How do I find neighboring subnets when planning a new network segment?▼

To find neighboring subnets when planning a network segment, input your current CIDR block. The calculator determines the adjacent network ranges and provides a human-readable summary of usable hosts and boundaries.

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