Castlemaine: landline numbers and carriers
Castlemaine is one of the town-level numbering areas the ACMA register uses under area code 03 (VIC & TAS). The register lists 36 number blocks for it with about 44,000 allocated numbers, held by 20 carriers. A landline that calls you from one of these blocks was issued for the Castlemaine 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 Castlemaine
TELSTRA LIMITED holds the largest share here with 63.6% of allocated numbers — with 19 other carriers alongside. The register names the range holder; individual numbers may operate on another network after porting.
| Carrier | Blocks | Numbers | Share |
|---|---|---|---|
| TELSTRA LIMITED | 4 | 28,000 | 63.6% |
| OPTUS NETWORKS PTY LIMITED | 3 | 3,000 | 6.8% |
| PIPE INTERNATIONAL (AUSTRALIA) PTY LTD | 2 | 3,000 | 6.8% |
| SYMBIO NETWORKS PTY LTD | 7 | 2,500 | 5.7% |
| OPTUS MOBILE PTY LIMITED | 1 | 2,000 | 4.5% |
| NETSIP PTY LTD | 3 | 1,200 | 2.7% |
| PRIMUS TELECOMMUNICATIONS PTY LIMITED | 2 | 1,100 | 2.5% |
| SOUL PATTINSON TELECOMMUNICATIONS PTY LIMITED | 2 | 1,100 | 2.5% |
| CHIME COMMUNICATIONS PTY LTD | 1 | 1,000 | 2.3% |
| ADARGA PTY LTD | 1 | 100 | 0.2% |
| AGILE PTY LTD | 1 | 100 | 0.2% |
| C2A INTERNET.COM.AU PTY. LTD. | 1 | 100 | 0.2% |
| CHECK TECHNOLOGY GROUP PTY LTD | 1 | 100 | 0.2% |
| LMGPS LTD | 1 | 100 | 0.2% |
| NETERA PTY LTD | 1 | 100 | 0.2% |
Number blocks registered for Castlemaine
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 |
|---|---|---|
| 0344006000… | 1,000 | OPTUS NETWORKS PTY LIMITED |
| 0344066000… | 2,000 | OPTUS MOBILE PTY LIMITED |
| 0344104000… | 1,000 | OPTUS NETWORKS PTY LIMITED |
| 0344109000… | 1,000 | SYMBIO NETWORKS PTY LTD |
| 0344120100… | 100 | VIRTUTEL PTY LTD |
| 0344169400… | 100 | SOUL PATTINSON TELECOMMUNICATIONS PTY LIMITED |
| 0344178700… | 100 | NETSIP PTY LTD |
| 0344189300… | 100 | THE TRUSTEE FOR READING FAMILY TRUST |
| 0344198400… | 100 | ADARGA PTY LTD |
| 0344209600… | 100 | SYMBIO NETWORKS PTY LTD |
| 0344210900… | 100 | WHY PAY MORE 4 LESS PTY LTD |
| 0344289200… | 100 | NETSIP PTY LTD |
| 0344300000… | 1,000 | SYMBIO NETWORKS PTY LTD |
| 0344301500… | 100 | CHECK TECHNOLOGY GROUP PTY LTD |
| 0344407800… | 100 | C2A INTERNET.COM.AU PTY. LTD. |
| 0344421000… | 100 | LMGPS LTD |
| 0344437000… | 1,000 | NETSIP PTY LTD |
| 0344440000… | 2,000 | PIPE INTERNATIONAL (AUSTRALIA) PTY LTD |
Excerpt: the 18 lowest of 36 allocated blocks (source: ACMA register).
Check a number from Castlemaine
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.