The streaming giant said it added 8.8 million customers in the three months to 21 December, up more than 6% from the prior quarter.
Revenue in the quarter jumped 27% from 2017 to almost $4.2bn (£3.2bn).
Television viewers in the US now spend about 10% of their time on Netflix, it added.
The firm also provided audience figures for some of its programmes.
The data offered investors a glimpse of the habits of Netflix customers, as it seeks to explain how its massive spending on content - much of it funded with debt - is paying off.
Analysts estimate that Netflix spent more than $13bn on movies and shows this year. including original titles such as Roma, Bird Box and the reality show, Tidying Up with Marie Kondo.
"Our multi-year plan is to keep significantly growing our content while increasing our revenue faster to expand our operating margins," Netflix said in a shareholder letter tied to the earnings report.
"Our growth is based on how good our experience is," it said.