How CGNAT affects IP geolocation for mobile users
Carrier-grade NAT pools large numbers of mobile subscribers behind a small number of public IP addresses, which puts a hard ceiling on how precise mobile IP geolocation can be.
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#cgnat
Mobile carrier NAT and what it does to IP accuracy
Thousands of phones on the same carrier network can share one public IP address. That single fact explains most of the accuracy limits on mobile geolocation.