a = %w(
10.55.2.150 94.190.178.98
10.30.200.9 94.190.183.152/29
10.30.54.24 94.190.183.13
10.32.100.131 94.190.178.114
10.16.77.100 94.190.178.66)

a.each_slice(2) { |k,v|
  puts "#{k} -> #{v}"
  puts "update ip_list set ip = '#{v}', ip_old = '#{k}' where ip = '#{k}';"
}