What is the nbn co? NBN Co was established in 2009 to design, build and operate Australia’s wholesale broadband access network. Australia, we've taken action. We’re working across key areas to improve your experience with the nbn ™ broadband access network. Which services will be switched off?Why cant i connect to the nbn in my building? Despite nbn ’s best efforts to connect the premises, the connection is prevented due to land geography or other significant barriers. The nbn ™ broadband access network is not currently available in your building.