Underbool: landline numbers and carriers
Underbool is one of the town-level numbering areas the ACMA register uses under area code 03 (VIC & TAS). The register lists 32 number blocks for it with about 38,000 allocated numbers, held by 20 carriers. A landline that calls you from one of these blocks was issued for the Underbool 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 Underbool
Underbool is spread across carriers: SYMBIO NETWORKS PTY LTD leads with 15.8% of allocated numbers, and 20 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 | 6 | 6,000 | 15.8% |
| TELSTRA LIMITED | 3 | 6,000 | 15.8% |
| SOUL PATTINSON TELECOMMUNICATIONS PTY LIMITED | 2 | 4,000 | 10.5% |
| PRIMUS TELECOMMUNICATIONS PTY LIMITED | 3 | 3,000 | 7.9% |
| NETSIP PTY LTD | 2 | 2,000 | 5.3% |
| OPTUS MOBILE PTY LIMITED | 1 | 2,000 | 5.3% |
| OPTUS NETWORKS PTY LIMITED | 2 | 2,000 | 5.3% |
| ADARGA PTY LTD | 1 | 1,000 | 2.6% |
| AGILE PTY LTD | 1 | 1,000 | 2.6% |
| C2A INTERNET.COM.AU PTY. LTD. | 1 | 1,000 | 2.6% |
| CHECK TECHNOLOGY GROUP PTY LTD | 1 | 1,000 | 2.6% |
| CHIME COMMUNICATIONS PTY LTD | 1 | 1,000 | 2.6% |
| GENNEXT ENTERPRISES PTY LTD | 1 | 1,000 | 2.6% |
| LMGPS LTD | 1 | 1,000 | 2.6% |
| NETERA PTY LTD | 1 | 1,000 | 2.6% |
Number blocks registered for Underbool
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 |
|---|---|---|
| 0340027000… | 1,000 | SYMBIO NETWORKS PTY LTD |
| 0340069000… | 1,000 | AGILE PTY LTD |
| 0340128000… | 1,000 | PRIMUS TELECOMMUNICATIONS PTY LIMITED |
| 0340184000… | 1,000 | SYMBIO NETWORKS PTY LTD |
| 0340236000… | 1,000 | PIPE NETWORKS PTY LIMITED |
| 0340278000… | 1,000 | SYMBIO NETWORKS PTY LTD |
| 0340321000… | 1,000 | VIRTUTEL PTY LTD |
| 0340364000… | 1,000 | SOUL PATTINSON TELECOMMUNICATIONS PTY LIMITED |
| 0340411000… | 1,000 | NETSIP PTY LTD |
| 0340454000… | 1,000 | LMGPS LTD |
| 0340497000… | 1,000 | THE TRUSTEE FOR READING FAMILY TRUST |
| 0340583000… | 1,000 | WHY PAY MORE 4 LESS PTY LTD |
| 0340623000… | 1,000 | SYMBIO NETWORKS PTY LTD |
| 0340624000… | 1,000 | SYMBIO NETWORKS PTY LTD |
| 0340669000… | 1,000 | GENNEXT ENTERPRISES PTY LTD |
| 0340697000… | 1,000 | NETSIP PTY LTD |
| 0340740000… | 1,000 | CHECK TECHNOLOGY GROUP PTY LTD |
| 0340783000… | 1,000 | C2A INTERNET.COM.AU PTY. LTD. |
Excerpt: the 18 lowest of 32 allocated blocks (source: ACMA register).
Check a number from Underbool
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.