Harrow: landline numbers and carriers
Harrow is one of the town-level numbering areas the ACMA register uses under area code 03 (VIC & TAS). The register lists 27 number blocks for it with about 16,900 allocated numbers, held by 18 carriers. A landline that calls you from one of these blocks was issued for the Harrow area — though the line may since have been ported, and caller ID can be spoofed.
Source: ACMA register, data as of 31/08/2026
The carriers in Harrow
Harrow is spread across carriers: TELSTRA LIMITED leads with 29.6% of allocated numbers, and 18 carriers hold blocks in total. The register names the range holder; individual numbers may operate on another network after porting.
| Carrier | Blocks | Numbers | Share |
|---|---|---|---|
| TELSTRA LIMITED | 1 | 5,000 | 29.6% |
| SOUL PATTINSON TELECOMMUNICATIONS PTY LIMITED | 2 | 3,100 | 18.3% |
| SYMBIO NETWORKS PTY LTD | 7 | 2,500 | 14.8% |
| OPTUS MOBILE PTY LIMITED | 1 | 2,000 | 11.8% |
| PRIMUS TELECOMMUNICATIONS PTY LIMITED | 2 | 1,100 | 6.5% |
| CHIME COMMUNICATIONS PTY LTD | 1 | 1,000 | 5.9% |
| OPTUS NETWORKS PTY LIMITED | 1 | 1,000 | 5.9% |
| NETSIP PTY LTD | 2 | 200 | 1.2% |
| ADARGA PTY LTD | 1 | 100 | 0.6% |
| C2A INTERNET.COM.AU PTY. LTD. | 1 | 100 | 0.6% |
| CHECK TECHNOLOGY GROUP PTY LTD | 1 | 100 | 0.6% |
| LMGPS LTD | 1 | 100 | 0.6% |
| NETERA PTY LTD | 1 | 100 | 0.6% |
| PIPE NETWORKS PTY LIMITED | 1 | 100 | 0.6% |
| PIVOTEL SATELLITE PTY LIMITED | 1 | 100 | 0.6% |
Number blocks registered for Harrow
The ACMA allocates geographic numbers in blocks tied to this numbering area. Every registered block for this area is allocated to a carrier.
| Block start | Numbers | Held by |
|---|---|---|
| 0345036000… | 2,000 | OPTUS MOBILE PTY LIMITED |
| 0345057200… | 100 | VIRTUTEL PTY LTD |
| 0345074000… | 1,000 | SYMBIO NETWORKS PTY LTD |
| 0345100300… | 100 | SOUL PATTINSON TELECOMMUNICATIONS PTY LIMITED |
| 0345106400… | 100 | NETSIP PTY LTD |
| 0345117600… | 100 | THE TRUSTEE FOR READING FAMILY TRUST |
| 0345127600… | 100 | ADARGA PTY LTD |
| 0345137800… | 100 | WHY PAY MORE 4 LESS PTY LTD |
| 0345145800… | 100 | SYMBIO NETWORKS PTY LTD |
| 0345189900… | 100 | NETSIP PTY LTD |
| 0345203000… | 100 | CHECK TECHNOLOGY GROUP PTY LTD |
| 0345215100… | 100 | C2A INTERNET.COM.AU PTY. LTD. |
| 0345224000… | 1,000 | SYMBIO NETWORKS PTY LTD |
| 0345225200… | 100 | LMGPS LTD |
| 0345237300… | 100 | PIVOTEL SATELLITE PTY LIMITED |
| 0345249400… | 100 | NETERA PTY LTD |
| 0345263500… | 100 | SYMBIO NETWORKS PTY LTD |
| 0355083000… | 3,000 | SOUL PATTINSON TELECOMMUNICATIONS PTY LIMITED |
Excerpt: the 18 lowest of 27 allocated blocks (source: ACMA register).
Check a number from Harrow
Worth knowing
- Block data tells you where a line was issued, not who is calling — and scammers routinely spoof local landline numbers to make a call look nearby.
- Learn more: the Australian area codes guide and how caller ID spoofing works.