Australian ISP iiNet will bill its National Broadband Network (NBN) service subscribers for at least $50 a month.

In its recently released packages, iiNet offers three plans with different data quotas, ranging from the minimum $49.95 plan with 40GB per month (20GB on-peak, 20 GB off) to one terabyte.

Customers can choose to boost internet speed with 'Turbo pack,' for connection rate of up to a maximum 100/40Mbps, counting in uploads and downloads in subscribers' data quota.

The $49.95 monthly bill covers 40GB data quota and maximum speeds of 12 Mbps. The 200GB plans will cost $59.95 at the same speed. An increased speed to 25 Mbps will cost an extra $5 a month. Fifty Mbps will cost an extra $15 and 100Mbps an extra $20.

"iiNet is particularly excited that the roll-out of NBN is focused on regions traditionally burdened with slower speeds and higher prices," iiNet CEO, Michael Malone, said in a statement.

"Without the need for a fixed phone line, the customers on our most popular ADSL1 plan can move to NBN speeds and enjoy 10 times the quota for the same price they're paying now."

iiNet is Australia's third-largest internet service provider behind Optus and Telstra, both of which have yet to reveal their NBN prices.