If it is an anycast IP address, we have hints of all locations. However, because we have to produce a standard IP geolocation product, we can only select one address. So, we choose the address we find from a reliable geofeed and designate the IP address as "anycast" in the API response.

Internally, we have an anycast database. I believe we can also provide all the location hints we see for each anycast IP. It is generally niche data though.