You could try searching for Coporate Bonds/Debuntures on NSDL website or CDSL website (their Advance Search has lot of filtering options). For Government Bonds, RBI website has a list of outstanding G-Secs. Refer to CCIL India website for information about T-Bills and State G-Secs. I had created a more readable list of them (accessible at Outstanding Government of India Securities (G-secs) and the interest payment dates and List Of Treasury Bills Outstanding as on July 10, 2022 and List of State Government Securities outstanding as on March 23, 2021) but those are now out of date.