Sydenham: landline numbers and carriers
Sydenham is one of the town-level numbering areas the ACMA register uses under area code 03 (VIC & TAS). The register lists 63 number blocks for it with about 259,000 allocated numbers, held by 22 carriers. A landline that calls you from one of these blocks was issued for the Sydenham 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 Sydenham
TELSTRA LIMITED holds the largest share here with 42.1% of allocated numbers — with 21 other carriers alongside. The register names the range holder; individual numbers may operate on another network after porting.
| Carrier | Blocks | Numbers | Share |
|---|---|---|---|
| TELSTRA LIMITED | 21 | 109,000 | 42.1% |
| OPTUS NETWORKS PTY LIMITED | 5 | 41,000 | 15.8% |
| OPTUS MOBILE PTY LIMITED | 4 | 22,000 | 8.5% |
| PRIMUS TELECOMMUNICATIONS PTY LIMITED | 4 | 13,000 | 5% |
| SOUL PATTINSON TELECOMMUNICATIONS PTY LIMITED | 4 | 13,000 | 5% |
| CHIME COMMUNICATIONS PTY LTD | 1 | 10,000 | 3.9% |
| PIPE INTERNATIONAL (AUSTRALIA) PTY LTD | 1 | 10,000 | 3.9% |
| PIPE NETWORKS PTY LIMITED | 1 | 10,000 | 3.9% |
| TPG TELECOM LIMITED | 1 | 10,000 | 3.9% |
| SYMBIO NETWORKS PTY LTD | 8 | 8,000 | 3.1% |
| NETSIP PTY LTD | 2 | 2,000 | 0.8% |
| ADARGA PTY LTD | 1 | 1,000 | 0.4% |
| AGILE PTY LTD | 1 | 1,000 | 0.4% |
| C2A INTERNET.COM.AU PTY. LTD. | 1 | 1,000 | 0.4% |
| CHECK TECHNOLOGY GROUP PTY LTD | 1 | 1,000 | 0.4% |
Number blocks registered for Sydenham
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 |
|---|---|---|
| 0373002000… | 1,000 | VIRTUTEL PTY LTD |
| 0373005000… | 1,000 | SOUL PATTINSON TELECOMMUNICATIONS PTY LIMITED |
| 0373008000… | 1,000 | NETSIP PTY LTD |
| 0373011000… | 1,000 | ADARGA PTY LTD |
| 0373014000… | 1,000 | THE TRUSTEE FOR READING FAMILY TRUST |
| 0373025000… | 1,000 | WHY PAY MORE 4 LESS PTY LTD |
| 0373029000… | 1,000 | SOUL PATTINSON TELECOMMUNICATIONS PTY LIMITED |
| 0373033000… | 1,000 | SYMBIO NETWORKS PTY LTD |
| 0373035000… | 1,000 | GENNEXT ENTERPRISES PTY LTD |
| 0373036000… | 1,000 | NETSIP PTY LTD |
| 0373037000… | 1,000 | SYMBIO NETWORKS PTY LTD |
| 0373040000… | 1,000 | CHECK TECHNOLOGY GROUP PTY LTD |
| 0373044000… | 1,000 | C2A INTERNET.COM.AU PTY. LTD. |
| 0373050000… | 1,000 | SOUL PATTINSON TELECOMMUNICATIONS PTY LIMITED |
| 0373063000… | 1,000 | LMGPS LTD |
| 0373066000… | 1,000 | PIVOTEL SATELLITE PTY LIMITED |
| 0373069000… | 1,000 | NETERA PTY LTD |
| 0373072000… | 1,000 | SYMBIO NETWORKS PTY LTD |
Excerpt: the 18 lowest of 63 allocated blocks (source: ACMA register).
Check a number from Sydenham
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.