Network Address Translation (NAT)
Definition
NAT translates network addresses between different network segments.
The translation of IP addresses and, if applicable, ports between network segments.
Simply explained
Like a mediator, it assigns internal devices to the externally used addresses and ports.
Why it matters in practice
Helps develop and operate digital systems robustly, securely, and maintainably.
Example from business
Multiple internal devices share a public IPv4 address via port mappings.
Limits and pitfalls
- Treating NAT as a firewall or overlooking protocols with embedded addresses.
Origin & history
NAT became widespread with IPv4 address scarcity and private address spaces; RFC 3022 describes Traditional NAT.
Use in mid-sized companies
- Possible application: Multiple internal devices share a public IPv4 address via port mappings.
Frequently asked questions
What does Network Address Translation (NAT) mean?
The translation of IP addresses and, if applicable, ports between network segments.
Which mistakes should be avoided?
Treating NAT as a firewall or overlooking protocols with embedded addresses.
Sources
Source checked on 10.10.2026. Editorial application examples are hypothetical; no evidence of real customer results.
Editorially reviewed on: