The P in IPO stands for 'Public' (Initial Public Offering). Public would include Retail + Institutional Investors. You can definitely subscribe to it in the retail quota once the issue is on offer (Assuming you fit the criteria). You need to go through the offer document to judge your eligibility.
There is no guarantee though, that you will be allotted the number of shares you applied for, because it depends upon the total number of subscriptions the offer recieves. Hope this helps.