ℹ️ Preview calculator: calculation logic is still being verified. Output may not reflect realistic engineering values. Details

NAT Port Mapping Calculator

Calculate NAT/PAT port pool requirements and oversubscription

Total internal devices NATed through public IP(s).
Browsing: 20-50, heavy: 100+.
Peak over average. Typical: 1.5-3.0x.
Number of public IPs for NAT.

NAT/PAT Analysis

Recommendations

References: RFC 3022 (Traditional NAT), RFC 4787 (NAT Requirements). Ephemeral ports: IANA 49152-65535, Linux 32768-60999.