| .au Domain Administration Ltd | Victoria |
| 101 Design Pty Ltd | New South Wales |
| 110 Solutions | New South Wales |
| 111IT | New South Wales |
| 12Three | Victoria |
| 16k Agency | Victoria |
| 1800 Onhold | Queensland |
| 1835 Capital | South Australia |
| 1receipt | Victoria |
| 1st Place Design Pty Ltd | New South Wales |
| 2 Dam Creative Pty Ltd | Victoria |
| 2 Ton Digital | Queensland |
| 2000 Computers & Networks Pty Ltd | Western Australia |
| 20DollarBanners.com | South Australia |
| 21 Designs | Queensland |
| 21 Web Solutions Pty Ltd | Northern Territory |
| 21st Century Internet Services | Victoria |
| 23 Creative | Australian Capital Territory |
| 23 Digital Pty Ltd | Victoria |
| 23shout Pty Ltd | Queensland |
| 24 Digital | Victoria |
| 247 Digital Pty Ltd | Victoria |
| 2am Webworks | Queensland |
| 2and2 Pty Ltd | New South Wales |
| 2excel | South Australia |
| 3 Phase Marketing | Victoria |
| 3 Tier Technology | Tasmania |
| 313 Halifax Street | South Australia |
| 33 Bondi | New South Wales |
| 360 Managed | Queensland |
| 360biolabs | Victoria |
| 360South Pty Ltd | Victoria |
| 3am Ideas | Western Australia |
| 3cubed | Queensland |
| 3Di | New South Wales |
| 3ivx Technologies Pty Ltd | New South Wales |
| 3rd Sense | New South Wales |
| 3rdmill Pty Ltd | New South Wales |
| 3Z Software | New South Wales |
| 42 Interactive Pty Ltd | New South Wales |
| 4am Software | Victoria |
| 4C Consulting | South Australia |
| 4Cabling Pty Ltd | New South Wales |
| 4D Global | Victoria |
| 4Impact Group | Queensland |
| 4IT Support Pty Ltd | New South Wales |
| 4mation | New South Wales |
| 4TBIZ Digital Agency | South Australia |
| 4th Party Pty Ltd | Victoria |
| 4ward Computer Services | Queensland |