Why NAT is used

• Saves public IP addresses
• Hides internal network structure
• Adds an extra layer of security

Example

Your home network might look like this:

• Laptop → 192.168.1.10
• Phone → 192.168.1.20
• Router → Public IP (e.g., 103.x.x.x)

When devices access the internet, the router converts private IPs to the public IP.

So websites cannot directly see your internal network devices.