JioFiber was on top of the list in November and December 2020 as well with 3.8Mbps speed. Tata Sky Broadband also offered 3.6Mbps in January 2021 alongside JioFiber. The two were followed by 7 Star Digital, Airtel, Atria Convergence Technologies (ACT), Excitel Broadband, Hathway, and Spectra. Bharat Sanchar Nigam Limited (BSNL) and Mahanagar Telephone Nigam Limited (MTNL) were at rank 5 and 6 with 2.8Mbps and 2.4Mbps respectively.
JioFiber has been delivering 3.6Mbps since August 2020 with a spike in November and December as mentioned earlier. Tata Sky Broadband has stayed consistent since August 2020 with 3.6Mbps. Airtel started with 3.6Mbps in August then dipped to 3.4Mbps for September and October, coming back up to 3.6Mbps in November and December, but falling to 3.4Mbps in January 2021.
Netflix calculates these figures based on actual usage during its prime-time hours, which are the top three hours of each day in terms of usage.