TPG delivered the fastest average broadband speeds to Australian Netflix subscribers in August.
Since Netflix's launch earlier this year, the two ISPs have dominated the speed comparison.
The speed comparisons are carried out in prime viewing time, according to Netflix.
Currently Netflix only compares Australian fixed line broadband connections.
However, Netflix has begun adding satellite and wireless categories to the system, which compares speeds in every country where the streaming service has an official presence.
TPG customers on average achieved a speed of 3.36 megabits per second, compared to iiNet's 3.35Mbps (both speeds represented an increase on the ISPs' previous results of 3.3Mbps and 3.32Mbps, respectively).
The two ISPs were followed by Optus (3.34Mbps), Exetel (2.98Mbps) and Dodo/Primus (2.89Mbps).
Telstra remained at the bottom of the leaderboard. The telco has attributed the result to its large customer base and the geographic spread of its ADSL customers. Telstra has a significant number of customers who don't live close to exchanges.
The Australian Competition and Consumer Commission (ACCC) last week released a report on a pilot broadband monitoring scheme.
The aim of such a scheme would be to give an indication of the real-world speed and quality of broadband connections that customers could expect from different ISPs.
The three-month pilot covered 90 Melbourne home fixed-line connections.
Hardware installed in the participants' premises monitored metrics including speeds, web browsing time, latency, packet loss, video streaming, jitter and DNS resolution speed.
"The ACCC believes a broadband performance monitoring and reporting program would promote competition and consumer outcomes by providing transparency over the quality of broadband services," ACCC chairperson Rod Sims said.