# SubNet Classer

> Analyze IPv4 addresses for class, CIDR, binary, mask, wildcard, hosts, and subnets.

Canonical page: [https://chrome-stats.com/d/subnet\_classer](https://chrome-stats.com/d/subnet_classer)

## Overview

- **ID:** `subnet_classer`
- **Platform:** Firefox
- **Type:** Firefox add-on
- **Status:** Available
- **Publisher:** Libor Benes (Dr. B)
- **Category:** web-development,privacy-security,search-tools
- **Daily users:** 0
- **Version:** 1.0
- **Last updated:** 2025-08-19
- **First published:** 2025-08-16
- **Size:** 18 KB
- **Data as of:** 2026-10-19
- **Store listing:** [Firefox Add-ons Store](https://addons.mozilla.org/firefox/addon/subnet_classer/)
- **Website:** [https://www.linkedin.com/in/LiborBenes](https://www.linkedin.com/in/LiborBenes)

## Description

Accurate IPv4 analyzer, complementing SubNet Calc.
• Enter an IPv4 address and optional CIDR (e.g., 192.168.1.1/24) to get detailed output.
• Copy results as plain text for documentation or monospaced editors (e.g., Notepad++, Excel).
• View IPv4 class table.

Security Prioritization:
• Minimal Design: Compact sidebar.
• Offline Operation: All calculations are local, ensuring privacy. No user data is collected or transmitted.
• Minimal Permissions.
• Safe Coding.
• Mozilla Compliance.
• Safe Error Handling.
• No Dependencies.

## Rankings

- #133,792 — Overall

## Permissions and access

### Permissions

- `activeTab`
- `storage`
- `clipboardWrite`

## Safety

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

### Analysis details

- Allows reading and modifying clipboard content, which can be sensitive, posing a moderate privacy risk.
- 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).

## Similar extensions and apps

- [SubNet Calc](https://chrome-stats.com/d/subnet_calc) — 1 users
- [SubNet Calc for Android](https://chrome-stats.com/d/subnet_calc_android) — 1 users
- [Flex Subnetting](https://chrome-stats.com/d/flex-subnetting) — 2 users
- [IP Subnet Calculator](https://chrome-stats.com/d/ip-subnet-calculator) — 4 users
- [IP Calculator](https://chrome-stats.com/d/ip-calc) — 1 users
- [CIDR Utils](https://chrome-stats.com/d/cidr-utils) — 1 users
- [CIDR Calculator](https://chrome-stats.com/d/cidr-calculator) — 0 users
- [IP Subnet](https://chrome-stats.com/d/ip-subnet) — 6 users
- [IP Address Inspector](https://chrome-stats.com/d/ip-address-inspector) — 1 users
- [Subnet Calc](https://chrome-stats.com/d/subnet-calc) — 6 users
- [Simple IP Calculator](https://chrome-stats.com/d/simple-ip-calculator) — 17 users, 4.00 / 5
- [IP Detail](https://chrome-stats.com/d/ip-detail) — 0 users

---

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