Lock: landline numbers and carriers
Lock is one of the town-level numbering areas the ACMA register uses under area code 08 (SA, WA & NT). The register lists 28 number blocks for it with about 15,100 allocated numbers, held by 19 carriers. A landline that calls you from one of these blocks was issued for the Lock 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 Lock
Lock is spread across carriers: TELSTRA LIMITED leads with 26.5% of allocated numbers, and 19 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 | 4,000 | 26.5% |
| SOUL PATTINSON TELECOMMUNICATIONS PTY LIMITED | 2 | 3,100 | 20.5% |
| SYMBIO NETWORKS PTY LTD | 7 | 2,500 | 16.6% |
| OPTUS MOBILE PTY LIMITED | 1 | 2,000 | 13.2% |
| CHIME COMMUNICATIONS PTY LTD | 1 | 1,000 | 6.6% |
| OPTUS NETWORKS PTY LIMITED | 1 | 1,000 | 6.6% |
| NETSIP PTY LTD | 2 | 200 | 1.3% |
| PRIMUS TELECOMMUNICATIONS PTY LIMITED | 2 | 200 | 1.3% |
| ADARGA PTY LTD | 1 | 100 | 0.7% |
| AGILE PTY LTD | 1 | 100 | 0.7% |
| C2A INTERNET.COM.AU PTY. LTD. | 1 | 100 | 0.7% |
| CHECK TECHNOLOGY GROUP PTY LTD | 1 | 100 | 0.7% |
| LMGPS LTD | 1 | 100 | 0.7% |
| NETERA PTY LTD | 1 | 100 | 0.7% |
| PIPE NETWORKS PTY LIMITED | 1 | 100 | 0.7% |
Number blocks registered for Lock
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 |
|---|---|---|
| 0876054000… | 1,000 | OPTUS NETWORKS PTY LIMITED |
| 0876210000… | 2,000 | OPTUS MOBILE PTY LIMITED |
| 0876259900… | 100 | VIRTUTEL PTY LTD |
| 0876299000… | 1,000 | SYMBIO NETWORKS PTY LTD |
| 0876337700… | 100 | SOUL PATTINSON TELECOMMUNICATIONS PTY LIMITED |
| 0876347500… | 100 | NETSIP PTY LTD |
| 0876365100… | 100 | THE TRUSTEE FOR READING FAMILY TRUST |
| 0876371100… | 100 | ADARGA PTY LTD |
| 0876388700… | 100 | WHY PAY MORE 4 LESS PTY LTD |
| 0876399900… | 100 | NETSIP PTY LTD |
| 0876497700… | 100 | CHECK TECHNOLOGY GROUP PTY LTD |
| 0876533500… | 100 | C2A INTERNET.COM.AU PTY. LTD. |
| 0876551300… | 100 | LMGPS LTD |
| 0876558000… | 1,000 | SYMBIO NETWORKS PTY LTD |
| 0876569100… | 100 | PIVOTEL SATELLITE PTY LIMITED |
| 0876587900… | 100 | NETERA PTY LTD |
| 0876605700… | 100 | SYMBIO NETWORKS PTY LTD |
| 0876659600… | 100 | SYMBIO NETWORKS PTY LTD |
Excerpt: the 18 lowest of 28 allocated blocks (source: ACMA register).
Check a number from Lock
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.