Precision in IP Lookup

Our 'What is my City Name' tool heavily relies on robust IP geolocation to provide users with their precise city. While the core functionality is solid, we've encountered persistent challenges in maintaining optimal geolocation accuracy, especially when dealing with specific types of IP addresses.

The primary pain points arise with mobile network IPs, where location data can be quite generalized, and even more so with VPN users and residential proxies. Our current setup, which primarily leverages GeoIP2 databases supplemented by a fallback API for unknown ranges, frequently yields discrepancies. These often manifest as city-level inaccuracies, leading to a degraded user experience for a segment of our audience.

We're looking to elevate our game beyond standard methods. What advanced techniques, alternative data sources, or multi-provider strategies have proven effective for achieving significantly higher city-level geolocation accuracy, particularly when combating the inherent challenges presented by dynamic IPs, mobile networks, and the anonymizing nature of VPNs and proxies? Any insights into novel approaches or specific vendor solutions that excel in these complex scenarios would be greatly appreciated.

Thanks in advance!