I work for IPinfo. We provide a free country and ASN database on a free tier with an unlimited amount of requests. You can download the entire database or use the API services. For country and ASN, it is free.

However, we do not offer city level data for free. > How would one even go about verifying it?

We believe we are the most accurate IP data provider out there, but you should come to that conclusion yourself.

I can tell you why our data is super accurate compared to the rest of the industry. The industry as a whole uses self-reported information that is offered by ASN and ISPs. It is called "geofeed". The issue with geofeed is that IP geolocation providers do not tend to verify the accuracy. Many providers just aggregate these public records and repeat what the ISPs and ASNs want them to tell them. This is a quite bad practice.

So we built a network of distributed servers (currently 1360 servers across 160 countries) that run ping, traceroute and other internet measurements and try to infer the location of IP geolocations. This means when you come to asking how do I know you are accurate, we can share our active measurement data and tell you that this is the evidence.

Now, comes the qustions of how you identify accuracy yourself.

First, if you have access to a large pool of known locations of IP addresses, you can run comparisons across different vendors. You need a GPS-backed device to locate IP addresses.

If you do not have a large pool of well-known location IPs, you can take a sample of IP addresses and check them yourself across multiple vendors. You can then use a tool like ping.sx or our own tool ipinfo.io/probenet/live to see evidence of where these IP addresses are located based on latency.

Do not bet on consensuses among IP geolocation providers; run your own tests.

Our data was evaluated by peer-reviewed academic research. You can take a look at that as well, if you want.

> I am not really using this data for anything other than have enough data to troubleshoot customer support/fraud.

Now, I will be honest...you should not pay anything to us. The way you have describing your issue, it seems like the free services we already offer that should satisfy your need.

Do you really need large scale IP address enrichment of all the IP addresses that visit your website? If yes, then for the first layer use our free data that provides ASN and country information.

Then, when you need troubleshooting with your customers, you can look up those individual IP addresses for free on our website, where we provide all our data for free access.

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Let me know if you need any help, always happy to answer questions.