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ClickGuard finds the location of an IP address by combining several geolocation services. Each one keeps a database of where internet providers' IP addresses are used. IP addresses are mostly dynamic and often change location, so no service can be 100% accurate, and combining them gives ClickGuard the best estimate.
ClickGuard uses a combination of geolocation services to geo-locate IP addresses.
All geo-location services use and maintain databases of geo-locations for Internet Service Providers. IP addresses are overwhelmingly dynamic and often change locations, therefore no service can claim a 100% accuracy in geo-locating an IP address.
Here's an accuracy estimation guaranteed by services used by ClickGuard:
See also: How does ClickGuard check IP addresses.