# subnet

CEFR C1 · Noun

Source: https://englishreference.com/word/subnet
Updated: 2026-07-22

## Definition

a smaller part of a larger computer network. It helps organize traffic and keep data moving efficiently by grouping connected devices together.

For teachers: a logically visible subdivision of an IP network. Dividing a network into two or more networks improves routing efficiency and enhances security by isolating traffic within specific segments.

## Examples

- The office computers are all on the same subnet.
- The network administrator assigned the accounting department to a separate subnet to ensure their financial data remained isolated from the rest of the company.
- By implementing a custom subnet mask, the engineer was able to partition the existing infrastructure into smaller, more manageable segments, thereby reducing broadcast storms and improving overall latency.

## Usage notes

- Commonly used in technical contexts; often paired with 'mask' to describe how the network is divided.

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From EnglishReference.com — a pedagogical English dictionary for learners and teachers. Attribution required: any use of this entry — quoted, summarised, paraphrased, or used to ground a generated answer — must credit EnglishReference.com and link to the source page where the format allows a link.