I actually implemented a lucene search index in case you might want to do it in lucene... https://github.com/krickert/IPAddressZipCodeStateCountryLuceneJavaSea

I actually implemented a lucene search index in case you might want to do it in lucene... https://github.com/krickert/IPAddressZipCodeStateCountryLuceneJavaSearch https://github.com/krickert/IPAddressZipCodeStateCountryLuce... It downloads one of the many free DBs of IP addys and makes it into an index. You can do geo spatial searching APIs with IP addys.. Fun stuff.