Every day, users inside organisations access thousands of websites:

business applications

social media

cloud services

streaming platforms

unknown external sites

Not all of these websites are safe, appropriate, or productive.

URL filtering is a network security technique used to control which websites users can access based on security policies, categories, or reputation.

This article explains how URL filtering works, why organisations use it, and what its limitations are.

What is URL filtering?

URL filtering is the process of allowing or blocking access to websites based on their URL, domain name, category, or reputation.

It is commonly used to:

block malicious websites

restrict inappropriate content

enforce acceptable-use policies

reduce distractions and bandwidth consumption

URL filtering is typically implemented at:

firewalls

web gateways

proxy servers

DNS filtering systems

unified threat management (UTM) appliances

How URL filtering works

When a user requests access to a website,…