GlossaryNetworkingIntermediate

Subnet

A subnet is a smaller network carved out of a larger IP address range, grouping related addresses together. It helps organize and route traffic efficiently.

Last updated June 8, 2026

Definition

A subnet (short for sub-network) is a logical subdivision of a larger IP network. By splitting a big block of addresses into smaller groups, network administrators can organize devices, improve routing efficiency, and contain traffic within defined boundaries.

How it works

Subnets are defined using a subnet mask or CIDR notation, which marks how many bits of an IP address identify the network versus individual hosts. For example, 192.168.1.0/24 describes a subnet of 256 addresses where the first 24 bits are the network portion. Routers use this information to forward packets to the correct subnet.

Why it matters for proxies and anti-bot systems

Subnets are central to how proxies are bought, distributed, and detected. Proxy providers often sell IPs in contiguous subnet blocks, and anti-bot systems exploit this: if several requests arrive from the same /24 subnet, they may all be flagged together even if individual IPs rotate. Good proxy pools therefore spread addresses across many diverse subnets to avoid subnet-level bans.

  • Group and route addresses efficiently
  • Detect bot traffic clustered in one subnet
  • Evaluate proxy IP diversity

Examples

1

192.168.1.0/24 (a 256-address subnet)

2

10.0.0.0/8 split into many /24 subnets

3

Anti-bot rule banning a whole /24 after abuse

Common Use Cases

Organizing devices within a network
Evaluating proxy pool IP diversity
Detecting clustered bot traffic by subnet
Efficient routing in large networks

Frequently Asked Questions

A subnet mask defines which part of an IP address identifies the network and which part identifies individual hosts. In CIDR form like /24 it tells you how many addresses belong to that subnet.
Anti-bot systems notice when many requests come from the same IP block. Banning the entire subnet is an efficient way to stop abuse, so diverse subnets across a proxy pool reduce this risk.

Keep Learning

All terms

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Datacenter Proxy

A datacenter proxy is an IP address belonging to a hosting company rather than an internet provider. It is fast, cheap and available in bulk — and instantly identifiable to any site that checks who owns the address.

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IP Rotation

IP rotation is the practice of deliberately changing the source IP address your requests come from, spreading a large job across many addresses so no single one exceeds what a target tolerates.

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CGNAT (Carrier-Grade NAT)

CGNAT is a technique carriers use to share one public IP among many customers — which is exactly why mobile proxy IPs are so trusted and hard to block.

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