How can I check if my passport is blacklisted or not in India ?
As of now, there is no way to check online whether your passport is blacklisted or not.
If you are a foreigner, you can do the following.
Contact the Indian High Commission in your country and speak to them about the issue. They may be able to offer some clarity as to whether your passport is black listed or not.
Speak to the Department of Immigration and Emigration in your countru, and see if they can offer some insight into the status of your passport.
If you are in India, you can contact the immigration department to check whether your passport is blacklisted in the immigration or not.