Whose number starts with 0403?
The 0403 mobile prefix appears in the ACMA register as held by OPTUS MOBILE PTY LIMITED. Important: the register names the range holder; after number porting an individual 0403 number can operate on any other network today.
Source: ACMA register, data as of 31/08/2026
The 0403 ranges in the ACMA register
The 0403 window is covered by 3 allocations with a combined capacity of about 1m numbers, in the hands of 1 holder.
| Range start | Numbers | Held by |
|---|---|---|
| 0403000000… | 200,000 | OPTUS MOBILE PTY LIMITED |
| 0403200000… | 200,000 | OPTUS MOBILE PTY LIMITED |
| 0403400000… | 600,000 | OPTUS MOBILE PTY LIMITED |
No published reports for this prefix yet.
Check a 0403 number
Worth knowing
- The prefix tells you where a line was issued, not who is calling: range data is not personal data, and the number on your screen can be spoofed.
- Report scam calls to Scamwatch; unwanted telemarketing can be reported to the ACMA once your number has been on the Do Not Call Register for 30 days.
- Learn more: Who called me from this number? and Which carrier owns which mobile prefix?