What is NAT (Network Address Translation)?
A technique that maps multiple private IP addresses to a single public IP address, providing a basic layer of privacy by hiding internal network structure.
NAT allows multiple devices on a local network to share a single public IP address. While not designed as a privacy tool, it provides incidental privacy benefits.
How It Works
- Your router maintains a table mapping internal addresses to external connections
- Outgoing traffic appears to come from the router's public IP
- Incoming traffic is directed to the correct internal device based on the mapping
Privacy Implications
- Benefit: Individual devices aren't directly addressable from the internet
- Benefit: Multiple users share one public IP, providing some anonymity
- Limitation: The public IP still identifies your network
- Limitation: NAT is not a substitute for a VPN or proxy
CGNAT
Carrier-Grade NAT (CGNAT) adds another layer — your ISP shares one public IP among many customers. This can actually help privacy but causes issues with services that track by IP.
Related Terms
IP Address
A unique numerical identifier assigned to every device connected to a computer network. Your IP address reveals your approximate geographic location and can be used to track your online activity, link your actions across websites, and identify your internet service provider.
Proxy Server
An intermediary server that sits between your device and the internet, forwarding requests on your behalf. Proxies can provide privacy by hiding your IP address, but unlike VPNs, they typically don't encrypt traffic.
Virtual Private Network
A technology that creates a secure, encrypted connection over a less secure network, such as the public internet. VPNs mask your IP address, encrypt your internet traffic, and can make it appear as though you're browsing from a different location.
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