# Flex Subnetting

> IPv4 VLSM Subnet Calculator

Canonical page: [https://chrome-stats.com/d/flex-subnetting](https://chrome-stats.com/d/flex-subnetting)

## Overview

- **ID:** `flex-subnetting`
- **Platform:** Firefox
- **Type:** Firefox add-on
- **Status:** Available
- **Publisher:** Flex Subnetting Developer
- **Category:** web-development
- **Daily users:** 2
- **Version:** 1.3.2
- **Last updated:** 2024-03-08
- **First published:** 2024-03-07
- **Size:** 244 KB
- **Data as of:** 2026-09-26
- **Store listing:** [Firefox Add-ons Store](https://addons.mozilla.org/firefox/addon/flex-subnetting/)

## Description

Calculate, plan and manage complex subnets like a Pro.
A must have tool for Cloud Solution Architects and Network Engineers.

Features:
- Support Classless Addressing (VLSM)
- Automatic tagging ( Public/Private, etc )
- Customisable theme
- Export to CSV
- Save and Load Projects
- Split and Merge Preview

## Rankings

- #67,452 — Overall
- #200 — settings

## Permissions and access

### Permissions

- `storage`
- `https://www.googleapis.com/`

## Safety

- **Risk impact:** Moderate risk impact
- **Risk likelihood:** Moderate risk likelihood

### Analysis details

- Request access to the following domains: googleapis.com
- This extension has low user count. Unpopular extensions may not be stable or safe.

> Some risk analysis details are omitted from this free response. [Upgrade to view the full analysis](https://chrome-stats.com/pricing).

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Source: [Chrome-Stats](https://chrome-stats.com/d/flex-subnetting)