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Home / Glossary / VLSM

Glossary · Networking

VLSM

Variable Length Subnet Masking

In plain language

A way of cutting an address range into network pieces of different sizes so nothing is wasted.

The metaphor

Like cutting a plot of land into lots of different sizes depending on what each needs.

Going deeper

How it works

Different parts of a network need different numbers of addresses.
It lets each get just enough.
It is used by network engineers.
Small offices rarely need it.

How WILDCARD handles it

Network covers the managed firewall and switches that sit behind your provider's modem.

In practice

An engineer gives a small link two addresses and an office hundreds.
A plan splits space across sites.
A student practises splitting a range.

A question owners ask

Do I need it?

Rarely. Your provider handles addressing for you.

Where WILDCARD handles this

Network

Firewall managed and monitored
Switches kept current
On-prem Active Directory auth

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