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CGNAT guides

Plain-English guides to carrier-grade NAT: how to tell if you're behind it, what it breaks, and what to ask your ISP. ISP facts only, with sources.

Start here

• What is CGNAT? — the short explainer
• How to tell if you're behind CGNAT — compare your router's WAN IP with your public IP
• What is the CGNAT IP range 100.64.0.0/10?
• Am I behind CGNAT? — the free checker

Problems CGNAT causes

• Why do I keep getting CAPTCHAs or blocked? — shared IPs, rate limits and blocklists
• Strict or moderate NAT type? — what NAT type means and how CGNAT affects it
• Self-hosting behind CGNAT — what breaks when the internet has to reach your home
• Media server behind CGNAT
• Game server behind CGNAT
• Home automation behind CGNAT
• Security cameras behind CGNAT
• Remote desktop behind CGNAT
• Home file server behind CGNAT

Getting a public IP

• How to get a public IP on your ISP — hub for T-Mobile Home, Verizon 5G Home, AT&T Internet Air, Starlink, T-Mobile Fiber and Metronet
• Static IP prices by US home ISP — residential vs business fees, with sources
• ISPs without CGNAT · ISPs that use CGNAT · ISP finder

This site sticks to ISP facts. It doesn't review or recommend third-party products or services.