/usr/ is in ruby-ipaddress 0.8.0-2.
This file is owned by root:root, with mode 0o755.
..
/usr/share/
/usr/share/rubygems-integration/
/usr/share/rubygems-integration/1.9.1/
/usr/share/rubygems-integration/1.9.1/specifications/
/usr/share/rubygems-integration/1.9.1/specifications/ipaddress-0.8.0.gemspec
/usr/share/rubygems-integration/2.0/
/usr/share/rubygems-integration/2.0/specifications/
/usr/share/rubygems-integration/2.0/specifications/ipaddress-0.8.0.gemspec
/usr/share/doc/
/usr/share/doc/ruby-ipaddress/
/usr/share/doc/ruby-ipaddress/copyright
/usr/share/doc/ruby-ipaddress/changelog.Debian.gz
/usr/share/doc/ruby-ipaddress/README.rdoc.gz
/usr/lib/
/usr/lib/ruby/
/usr/lib/ruby/vendor_ruby/
/usr/lib/ruby/vendor_ruby/ipaddress.rb
/usr/lib/ruby/vendor_ruby/ipaddress/
/usr/lib/ruby/vendor_ruby/ipaddress/ipv6.rb
/usr/lib/ruby/vendor_ruby/ipaddress/ipv4.rb
/usr/lib/ruby/vendor_ruby/ipaddress/prefix.rb