/usr/ is in ruby-domain-name 0.5.20160216-2.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/ruby/vendor_ruby/
/usr/lib/
/usr/lib/ruby/
/usr/share/
/usr/share/doc/
/usr/share/doc/ruby-domain-name/
/usr/share/doc/ruby-domain-name/changelog.Debian.gz
/usr/share/doc/ruby-domain-name/copyright
/usr/share/doc/ruby-domain-name/TODO.Debian
/usr/share/doc/ruby-domain-name/README.md
/usr/share/rubygems-integration/
/usr/share/rubygems-integration/all/
/usr/share/rubygems-integration/all/specifications/
/usr/share/rubygems-integration/all/specifications/domain_name-0.5.20160216.gemspec
/usr/lib/ruby/vendor_ruby/domain_name.rb
/usr/lib/ruby/vendor_ruby/domain_name/
/usr/lib/ruby/vendor_ruby/domain_name/etld_data.rb
/usr/lib/ruby/vendor_ruby/domain_name/version.rb
/usr/lib/ruby/vendor_ruby/domain_name/punycode.rb
/usr/lib/ruby/vendor_ruby/domain_name/etld_data.rb.erb