Subnet Highlighter

Name: Subnet Highlighter
Author: Link

By: Link Add-on

Automatically highlights CIDR subnet masks on any page and shows IP count on hover

Overview

Firefox Add-ons Store

Daily users

3 ▲ 1

Data as of 2026-09-26

Version:

1.9

Last updated: 2026-08-31

Features & Capabilities

Subnet Highlighter automatically scans every page and highlights all CIDR subnet masks — both IPv4 (/0–/32) and IPv6 (/0–/128). Hover over any highlighted mask to instantly see detailed network information.

IPv4 shows:

Network & broadcast address, first/last host
Total IPs, usable hosts, subnet mask, wildcard
Binary mask representation
Class (A/B/C), Private/Public (RFC1918)
Parent network, host offset, reverse DNS zone (PTR)
Subnets if split into /28, /29, /30

IPv6 shows:

Network address, first/last host
Total addresses (as power of 2)
Type: Global Unicast, Link-local, ULA, Multicast, Loopback
Parent network, reverse DNS zone (ip6.arpa)
Subnets if split

IPv4 masks are highlighted in yellow, IPv6 in blue. Works on any page including wikis, monitoring dashboards, NOC tools, and RIPE/BGP looking glasses.

User Growth & Download Statistics

Add-on

By:

Link

Daily users:

3 1

Version:

1.9 Last updated: 2026-08-31

Version code:

6451210

Creation date:

2026-08-21

Firefox add-on GUID:

subnet-highlighter@extension

Firefox add-on numeric ID:

3057854

Firefox on Android:

Yes

Risk:

Permissions:

activeTab

Content scripts matches:

<all_urls>

Size:

19.17KB

Full description:

Source:

Firefox Add-ons Store

Data ingested on:

2026-09-26

Compare stats and ranking:

Ranking

# 56,427 ▲ 8,884

Other rankings

#120 in highlighter keyword 53 ▲ 21#171 in submit keyword 9 ▲ 41

For Developers

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Contact the developer

Chrome-Stats does not own this Firefox add-on. Please use these information below to contact the Firefox add-on developer.

Developed by:

Link

Firefox Add-ons Store

https://addons.mozilla.org/firefox/addon/subnet-highlighter/

Is Subnet Highlighter Safe?

Risk impact

Risk impact measures the level of extra permissions an extension has access to. A low risk impact extension cannot do much harms, whereas a high risk impact extension can do a lot of damage like stealing your password, bypassing your security settings, and accessing your personal data. High risk impact extensions are not necessarily malicious. However, if they do turn malicious, they can be very harmful.

Subnet Highlighter requires a few sensitive permissions. Exercise caution before installing.

Risk impact analysis details

Critical Allows access to all websites, posing a significant security risk as it can monitor and modify data from any visited site.
High ******* ******* **** *** ****** ***** *** ***** ** ******* **** ********* ********* ** * *********** *****

Risk likelihood

Risk likelihood measures the probability that a Firefox add-on may turn malicious. This is determined by the publisher and the Firefox add-on reputation on Firefox Add-ons Store, the amount of time the Firefox add-on has been around, and other signals about the Firefox add-on. Our algorithms are not perfect, and are subject to change as we discover new ways to detect malicious extensions. We recommend that you always exercise caution when installing a Firefox add-on.

Subnet Highlighter is recently added, and hasn't been around long enough for us to gather enough data to accurately assess its risk level.

Risk likelihood analysis details

High This extension was recently updated in the past month. New updates may not be stable or safe.
High **** ********* *** *** **** ****** ********* ********** *** *** ** ****** ** *****
Medium **** ********* *** ***** ** *** **** * ******* *** ********** *** *** ** ****** ** *****