CGNAT (Carrier-Grade NAT)
CGNAT is a technique carriers use to share one public IP among many customers — which is exactly why mobile proxy IPs are so trusted and hard to block.
Definition
Carrier-Grade NAT (CGNAT) is a large-scale form of Network Address Translation that lets an ISP or mobile carrier share a single public IPv4 address among hundreds or thousands of subscribers. It exists largely because IPv4 addresses are scarce.
Why CGNAT matters for proxies
Because many real users sit behind the same CGNAT public IP, blocking that IP would punish many legitimate customers. This is the core reason mobile proxies carry such high trust — banning a mobile IP is risky for a website. CGNAT also means the visible IP can change frequently as the carrier reassigns addresses.
Examples
Hundreds of mobile subscribers sharing one carrier public IP
A mobile proxy's IP rotating naturally as the carrier reassigns it
Common Use Cases
Frequently Asked Questions
Keep Learning
All termsIP Rotation
IP rotation is the practice of automatically cycling through multiple IP addresses so that successive requests originate from different IPs.
Read definitionMobile Proxy
A mobile proxy routes traffic through real 3G/4G/5G cellular connections, using carrier-assigned IPs that are the hardest of all proxy types to detect or block.
Read definitionResidential Proxy
A residential proxy routes your traffic through a real device with an IP assigned by an Internet Service Provider, so requests appear to come from a genuine home user rather than a server.
Read definition