Point Topic expects there to be 940 million fixed broadband subscribers around the world by 2018.
The analyst says growth will continue over the coming years, although at a slower pace than it has previously predicted.
Point Topic noted that the 940 million estimate is lower than historic projections, explaining that the developing world is failing to catch up on fixed internet penetration as quickly as anticipated.
However, the firm said it still expects to see the one billion subscriber mark reached before the end of the decade.
"At the end of 2018, south and east Asia will have by far the greatest volume of broadband subscribers," Point Topic predicted.
"Subscriber numbers will grow by 70 per cent over the next five years. In particular, this is due to strong growth expected in Indonesia and Thailand."
The firm claimed growth will be slowest in the developed markets of Western Europe, Asia-Pacific and North America.
"Broadband subscriber numbers in the more mature markets - Western Europe, South Korea and Hong Kong - are only expected to grow by 14 per cent over the next five years," Point Topic said.