There are sites that provide geolocation of IPs. Is there a way to create a Splunk form for this function? Does the ip address in question need to be indexed somewhere prior?

Rather than use 3rd party websites, we'd like to use Splunk to geolocate an address that may not yet be indexed. Similarly, we have many network ranges, so we'd like to search an arbitrary address to find at which of our locations it resides. The ranges are in an index, but not all gazillion addresses we own.