Cumborah: landline numbers and carriers
Cumborah is one of the town-level numbering areas the ACMA register uses under area code 02 (NSW & ACT). The register lists 28 number blocks for it with about 11,000 allocated numbers, held by 18 carriers. A landline that calls you from one of these blocks was issued for the Cumborah 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 Cumborah
Cumborah is spread across carriers: SYMBIO NETWORKS PTY LTD leads with 22.7% 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 |
|---|---|---|---|
| SYMBIO NETWORKS PTY LTD | 7 | 2,500 | 22.7% |
| OPTUS MOBILE PTY LIMITED | 1 | 2,000 | 18.2% |
| TELSTRA LIMITED | 2 | 2,000 | 18.2% |
| SOUL PATTINSON TELECOMMUNICATIONS PTY LIMITED | 2 | 1,100 | 10% |
| CHIME COMMUNICATIONS PTY LTD | 1 | 1,000 | 9.1% |
| OPTUS NETWORKS PTY LIMITED | 1 | 1,000 | 9.1% |
| NETSIP PTY LTD | 2 | 200 | 1.8% |
| PRIMUS TELECOMMUNICATIONS PTY LIMITED | 2 | 200 | 1.8% |
| ADARGA PTY LTD | 1 | 100 | 0.9% |
| AGILE PTY LTD | 1 | 100 | 0.9% |
| C2A INTERNET.COM.AU PTY. LTD. | 1 | 100 | 0.9% |
| CHECK TECHNOLOGY GROUP PTY LTD | 1 | 100 | 0.9% |
| LMGPS LTD | 1 | 100 | 0.9% |
| NETERA PTY LTD | 1 | 100 | 0.9% |
| PIPE NETWORKS PTY LIMITED | 1 | 100 | 0.9% |
Number blocks registered for Cumborah
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 |
|---|---|---|
| 0258019000… | 1,000 | OPTUS NETWORKS PTY LIMITED |
| 0258136000… | 2,000 | OPTUS MOBILE PTY LIMITED |
| 0258247200… | 100 | VIRTUTEL PTY LTD |
| 0258269000… | 1,000 | SYMBIO NETWORKS PTY LTD |
| 0258315800… | 100 | SOUL PATTINSON TELECOMMUNICATIONS PTY LIMITED |
| 0258325400… | 100 | NETSIP PTY LTD |
| 0258342000… | 100 | LMGPS LTD |
| 0258350600… | 100 | THE TRUSTEE FOR READING FAMILY TRUST |
| 0258381800… | 100 | NETSIP PTY LTD |
| 0258395800… | 100 | SYMBIO NETWORKS PTY LTD |
| 0258517000… | 100 | CHECK TECHNOLOGY GROUP PTY LTD |
| 0258555600… | 100 | C2A INTERNET.COM.AU PTY. LTD. |
| 0258585200… | 100 | PIVOTEL SATELLITE PTY LIMITED |
| 0258605000… | 1,000 | SYMBIO NETWORKS PTY LTD |
| 0258612900… | 100 | ADARGA PTY LTD |
| 0258630500… | 100 | NETERA PTY LTD |
| 0258656100… | 100 | SYMBIO NETWORKS PTY LTD |
| 0268044000… | 1,000 | SOUL PATTINSON TELECOMMUNICATIONS PTY LIMITED |
Excerpt: the 18 lowest of 28 allocated blocks (source: ACMA register).
Check a number from Cumborah
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.