What Is NAT (Network Address Translation)?

NAT lets many devices on a private network share a single public IP address when communicating with the outside internet.

Why It's Widely Used

Public IPv4 addresses are limited, and NAT lets an entire home or office network operate on just one public address, with the router translating traffic to and from each internal device.

A Security Side Effect

Since devices behind NAT aren't directly reachable from the internet, it provides a degree of accidental protection, though it's not a substitute for a real firewall.

Further Reading

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