Release v2.0.0

iprange 2.0.0

Major release adding IPv6 support and significant code quality improvements.

New features

• IPv6 support — --ipv6 / -6 flag enables IPv6 mode with full set operations (merge, intersect, exclude, diff, compare, reduce, count)
• IPv4 input normalized to ::ffff:x.x.x.x in IPv6 mode
• IPv4-mapped IPv6 (::ffff:x.x.x.x) converted back to IPv4 in IPv4 mode
• IPv6 DNS resolution (both AAAA and A records)
• IPv6 binary format v2.0 with family-aware header
• --has-ipv6 feature detection flag
• @filename file list and @directory directory loading
• --has-filelist-loading and --has-directory-loading flags

Bug fixes

• Fix UINT32_MAX boundary overflow — ranges at 255.255.255.255 no longer incorrectly merge with ranges at 0.0.0.0 (#28)
• Fix IPv6 diff algorithm at address space boundary
• Strict numeric parsing for --ipset-reduce value (#24)

Build improvements

• -O3 and LTO enabled for GCC builds
• CMakeLists.txt for IDE support
• Updated test suite: 93 CLI tests, 7 build tests, 5 sanitizer tests, 6 unit tests, 1 TSAN test

Documentation

• Comprehensive README and wiki with verified examples
• One wiki page per operation
• Detailed guides for input/output formats, IPv6, DNS resolution, ipset optimization