Enriching MMDB files with your own data using Go

MaxMind DB (or MMDB) files facilitate the storage and retrieval of data in connection with IP addresses and IP address ranges, making queries for such data very fast and easy to perform. While MMDB files are usable on a variety of platforms and in a number of different programming languages, this article will focus on building MMDB files using the Go programming language . MaxMind offers several prebuilt MMDB files, like the free GeoLite2 Country MMDB file. For many situations these MMDB files are useful enough as is. If, however, you have your own data associated with IP address ranges, you can create hybrid MMDB files, enriching existing MMDB contents with your own data. In this article, we’re going to add details about a fictional company’s IP address ranges to the GeoLite2 Country MMDB file. We’ll be building a new MMDB file, one that contains both MaxMind’s and our fictional company’s data.