Boosting ISP Lookup Accuracy?

Hey everyone,

• Context: We’ve been running our web tool, "What is My ISP? - Find Your Internet Service Provider," for a while now, and it’s getting some decent traction. Its core function, as the name suggests, is to help users quickly identify their internet service provider based on their IP address. We’re really happy with the engagement, but we've hit a specific challenge that's becoming a bit of a bottleneck.
• The Problem: While the tool generally works well for most users, we're consistently seeing inconsistent or incorrect internet service provider identification for a noticeable percentage of our audience. This issue is particularly prevalent in certain geographic regions, or for specific types of connections like mobile data, users behind VPNs, or certain business IPs. It’s frustrating because we want to provide precise information, but these edge cases are really dragging down the overall accuracy.
• Current Approach: Our current method for ISP detection involves a combination of public IP databases, primarily GeoLite2 and IP-API, alongside performing reverse DNS lookups. We try to cross-reference data to get the most reliable result.
• Challenges & Limitations: The main reasons our current approach isn't always accurate seem to be multi-faceted. Public databases, while useful, can often be outdated or lack granular detail for smaller regional internet service providers. Reverse DNS, while promising, frequently shows hosting providers (like AWS or Google Cloud) instead of the actual user's internet service provider, especially for residential users whose traffic might be routed through cloud infrastructure. Furthermore, some ISP networks are simply not well-documented publicly, making identification a shot in the dark.
• Seeking Advice: This is where I'm hoping the community can help! What other data sources, APIs, or methodologies could we explore to significantly improve the accuracy of internet service provider identification? Are there any lesser-known techniques, perhaps some network-level tricks, or even premium services that offer substantially better results for this kind of lookup? We’re open to exploring different avenues.
• Goal: Ultimately, our goal is to provide the most accurate internet service provider information possible to our users, making "What is My ISP?" the go-to tool for this specific need. Any insights or recommendations would be incredibly valuable.

Thanks in advance!