Hello, There are the top ranked universities for MS in Australia

• Australian National University
• University of Melbourne
• University of New South Wales
• University of Queensland
• University of Sydney

The Australian universities offer two intake sessions in February and July. The eligibility criteria is undergraduate degree in CS or IT or any relevant field with a CGPA of 7 minimum, though it depends on the institution you are applying to. You will needing either of the language proficiency test and the minimum score is as follows

• IELTS-6.5
• TOEFL- 79
• PTE- 58
• CAE-176

You should apply separately for each university after sorting out the universities you are wishing to apply. You will also be required a Statement of purpose. Recommendation letters and or work experience.

Hope this helps.