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GeoIP Legacy Java API

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Important Note

This API is for the GeoIP Legacy format (dat). To read the MaxMind DB format (mmdb) used by GeoIP2, please see our GeoIP2 Java API.

Define Your Dependencies

We recommend installing this package with Maven. To do this, add the dependency to your pom.xml:


Building Manually


mvn clean install


mvn package

The jar file will be in the target directory.


mvn test

IP Geolocation Usage

IP geolocation is inherently imprecise. Locations are often near the center of the population. Any location provided by a GeoIP database or web service should not be used to identify a particular address or household.

Memory Caching and Other Options

The following options can be passed as the second parameter to the LookupService constructor.

  • GEOIP_STANDARD - Read database from file system. Uses the least memory.
  • GEOIP_MEMORY_CACHE - Load database into memory. This provides faster performance but uses more memory
  • GEOIP_CHECK_CACHE - Check for updated database. If database has been updated, reload file handle and/or memory cache.
  • GEOIP_INDEX_CACHE - Cache only the most frequently accessed index portion of the database, resulting in faster lookups than GEOIP_STANDARD, but less memory usage than GEOIP_MEMORY_CACHE. This is useful for larger databases such as GeoIP Legacy Organization and GeoIP Legacy City. Note: for GeoIP Legacy Country, Region and Netspeed databases, GEOIP_INDEX_CACHE is equivalent to GEOIP_MEMORY_CACHE.

These options may be combined. For example:

LookupService cl = new LookupService(dbfile,
    LookupService.GEOIP_MEMORY_CACHE | LookupService.GEOIP_CHECK_CACHE);

Thread Safety

As of version 1.1.4 this API is thread safe.

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