TPG and Soul added a combined 88,000 broadband customers in the financial year ended July 31, pushing parent SP Telemedia's results into the black.
The parent reported a net profit after tax of $17.7 million, exceeding earlier guidance and trumping last year's $18.9 million loss.
"The continued growth of the business has been underpinned by broadband subscribers," SP Telemedia executive chairman David Teoh said in a statement.
The business added 56,000 broadband subscribers in the second half alone. Total subscribers reached 400,000 this month.
The telco also said increasing on-net services had lifted margins in its corporate and government business.
A report by the Australian Bureau of Statistics earlier this month found that the growth in fixed line broadband has stagnated due to the growth of wireless broadband services.