Updated 4:20pm 13.7.2016: added history of the rankings
Netflix has announced that Optus was the fastest major Australian internet service provider in June, according to its speed index rating.
Netflix' ISP speed index lists the prime time performance on ISPs around the globe.
In Australia, Optus registered 3.41 Mbps in fibre, cable and DSL. In second place was TPG with fibre and DSL registering 3.19 Mbps. iiNet, Exetel and Dodo-Primus followed in third, fourth and fifth places respectively.
Telstra was last in the list of six providers. Its fibre, cable and DSL services registered 2.48 Mbps speed during prime time, according to Netflix.
This week Telstra had its offerings analysed by consumer advocacy group Choice, which labelled the telco's higher pricing as the 'Telstra Tax' - for not providing the extra quality paid for by its customers. Telstra refuted those allegations, claiming it offers extras not included in the study.
The telco has experienced a difficult year with outages being recorded all over the country. The latest happened on 30 June affecting many enterprise systems, including Jetstar's check-in services.
The Netflix ISP speed index does not measure overall performance for other services or data that may travel across each of the ISP networks.
Since the entertainment streaming service landed in Australia early last year, it has maintained a ranking of all six providers and their speed rates.
In April 2015, the first tallied month, TPG was rated number one with 3.36Mbps, followed by Optus, iiNet, Exetel and Telstra.
Dodo-Primus joined the charts in May 2015 and after two months upped its speed rating to almost match Exetel.
It was only last October that Optus took the lead after several months of close battle between Optus, TPG and iiNet. From then on, Optus maintained first place, reaching its peak in December 2015 with 3.65 Mbps.
All ISPs hit its highest speeds between the months of November and December 2015.