Here is a summary of the article: There are several offline IP libraries available, including zxipv6wry, Ip2region, GeoIP, Ip2location, and PUREN databases. This article collects and summarizes the usage of these libraries in Java, including how to use them to translate IP addresses into meaningful information. The article provides a comprehensive overview of each library's features, including whether they support IPv4/IPv6, whether they are continuously updated, and any additional notes. It also provides Java code examples for using each library, including Ip2location and Ip2region.