Size deterministic NAT pools for residential subscriber networks.
Deterministic CGNAT sizing — 64512 usable ports per public IPv4 (excludes 0–1023).
Max subscribers: 4,032
Total available ports: 4,128,768
Oversubscription: 781.3:1 (users:public IP)
Pool exhausted — subscriber count exceeds capacity at this block size.
ALERT: 50,000 users exceed capacity (4,032 max at 1024 ports/block). Add public IPs, reduce block size, or enable additional NAT pools to avoid dropouts.
CGNAT Port-Block Calculator helps you size deterministic nat pools for residential subscriber networks. It is commonly used by network admins, IT support teams, ops engineers for cgnat calculator, nat port block, isp nat sizing.
Uses 64512 usable ports per public IP (excludes ports 0–1023).