An ISP may allocate an IP range over multiple postal codes. In such cases, MaxMind cannot accurately determine the exact postal code associated with an IP address in that range. Previously we only included a postal code if we were confident of the resolution. Now, we include more postal codes, returning a postal code within a 50km radius.
We are doing this as a convenience to our customers who want to use the postal code instead of the city to link to other data.
In addition, we’ve added Poland and Portugal to the list of countries for which we return postal codes. The full list of countries for which we provide postal codes now includes the following:
Argentina, Australia, Austria, Belgium, Brazil, Bulgaria, Canada, Croatia, Czech Republic, Denmark, Finland, France, Germany, Hungary, Iceland, India, Italy, Malaysia, Mexico, Netherlands, New Zealand, Norway, Pakistan, Poland, Portugal, Russia, Slovakia, South Africa, Spain, Sweden, Switzerland, Thailand, United Kingdom, United States.