ranver.rb

class RanVer
  def self.generate
    segments = []
    2.times do
      segments << case rand(10) + 1
                  when 1
                    rand(1000)
                  when 2..3 
                    rand(100)
                  else
                    rand(10)
                  end
    end

    segments << case rand(10) + 1
                when 1
                  rand(1000) + 1
                when 2..5
                  rand(100) + 1
                else
                  rand(10) + 1
                end

    segments.join '.'
  end
end