Horsham: landline numbers and carriers
Horsham is one of the town-level numbering areas the ACMA register uses under area code 03 (VIC & TAS). The register lists 50 number blocks for it with about 75,000 allocated numbers, held by 19 carriers and spread over the 0343… and 0353… dialling prefixes. That makes Horsham the 21st largest of 475 numbering areas under 03 by block count, with 0.22% of the area code's allocated numbers. A landline that calls you from one of these blocks was issued for the Horsham area — though the line may since have been ported, and caller ID can be spoofed.
Source: ACMA register, data as of 15/10/2026
Where Horsham is
- State or territory
- Victoria
- Council area
- Horsham
- Local time
- — AEST, UTC+10; AEDT, UTC+11 in summer
- Number format
- 03 43xx xxxx; from overseas +61 3 43xx xxxx
- Nearest numbering areas
- Kalkee (19 km), Natimuk (23 km), Laharum (26 km), Murtoa (28 km), Dadswells Bridge (34 km)
Locality, council and state: ABS ASGS Edition 3 (CC BY 4.0). Distances are straight-line between localities.
How Horsham was numbered
The oldest block in Horsham was allocated on 30 June 1991 and is held today by TELSTRA LIMITED; the newest on 19 August 2026 to SYMBIO NETWORKS PTY LTD. Most of the area's blocks — 11 of 50 — date from 2020–2024, but allocations here span 35 years. 18 of the blocks are the standard 1,000-number size, 22 are 100-number blocks of the kind the ACMA has issued to VoIP and wholesale carriers since the mid-2000s. 11 allocated blocks have changed hands since they were first issued: the register still names AAPT LIMITED, ENGIN PTY LIMITED, GOTALK LIMITED, IPTEL PTY LIMITED, IVOX PTY LTD, TWILIO AUSTRALIA PTY LTD and VOCUS PTY LTD as original allocatees of blocks now held by other carriers.
| Period | Blocks allocated |
|---|---|
| 1990–1994 | 5 |
| 2000–2004 | 6 |
| 2005–2009 | 8 |
| 2010–2014 | 6 |
| 2015–2019 | 10 |
| 2020–2024 | 11 |
| 2025–2029 | 4 |
The carriers in Horsham
TELSTRA LIMITED holds the largest share here with 49.3% of allocated numbers across 6 blocks; OPTUS NETWORKS PTY LIMITED is second with 26.5%, and 17 other carriers hold the rest. TELSTRA LIMITED has the longest tenure, with a block dated 30/06/1991; SYMBIO NETWORKS PTY LTD received the newest, on 19/08/2026. OPTUS NETWORKS PTY LIMITED (1), SYMBIO NETWORKS PTY LTD (5) and PIPE NETWORKS PTY LIMITED (3) hold blocks originally allocated to another carrier.
| Carrier | Blocks | Numbers | Share | First block | Latest block |
|---|---|---|---|---|---|
| TELSTRA LIMITED | 6 | 37,000 | 49.3% | 30/06/1991 | 23/12/2016 |
| OPTUS NETWORKS PTY LIMITED | 8 | 19,900 | 26.5% | 12/11/2004 | 20/06/2019 |
| SYMBIO NETWORKS PTY LTD | 11 | 5,600 | 7.5% | 12/11/2004 | 19/08/2026 |
| NETSIP PTY LTD | 4 | 2,200 | 2.9% | 14/02/2018 | 02/06/2022 |
| PIPE NETWORKS PTY LIMITED | 3 | 2,100 | 2.8% | 03/09/2012 | 29/05/2023 |
| PRIMUS TELECOMMUNICATIONS PTY LIMITED | 3 | 2,100 | 2.8% | 24/12/2004 | 15/03/2017 |
| SOUL PATTINSON TELECOMMUNICATIONS PTY LIMITED | 3 | 2,100 | 2.8% | 30/03/2000 | 17/06/2021 |
| OPTUS MOBILE PTY LIMITED | 1 | 2,000 | 2.7% | 08/10/2007 | 08/10/2007 |
| CHIME COMMUNICATIONS PTY LTD | 1 | 1,000 | 1.3% | 14/07/2004 | 14/07/2004 |
| ADARGA PTY LTD | 1 | 100 | 0.1% | 16/09/2025 | 16/09/2025 |
| AGILE PTY LTD | 1 | 100 | 0.1% | 03/04/2007 | 03/04/2007 |
| C2A INTERNET.COM.AU PTY. LTD. | 1 | 100 | 0.1% | 13/07/2023 | 13/07/2023 |
| CHECK TECHNOLOGY GROUP PTY LTD | 1 | 100 | 0.1% | 31/01/2022 | 31/01/2022 |
| LMGPS LTD | 1 | 100 | 0.1% | 23/11/2023 | 23/11/2023 |
| NETERA PTY LTD | 1 | 100 | 0.1% | 24/10/2025 | 24/10/2025 |
| PIVOTEL SATELLITE PTY LIMITED | 1 | 100 | 0.1% | 16/04/2025 | 16/04/2025 |
| THE TRUSTEE FOR READING FAMILY TRUST | 1 | 100 | 0.1% | 21/10/2019 | 21/10/2019 |
| VIRTUTEL PTY LTD | 1 | 100 | 0.1% | 20/12/2015 | 20/12/2015 |
| WHY PAY MORE 4 LESS PTY LTD | 1 | 100 | 0.1% | 10/05/2018 | 10/05/2018 |
Number blocks registered for Horsham
Every registered block for this area is allocated to a carrier. All 50 blocks, ascending:
| Block start | Numbers | Original allocatee | Current holder | Allocated | Transferred |
|---|---|---|---|---|---|
| 0343000000… | 10,000 | = | OPTUS NETWORKS PTY LIMITED | 11/04/2007 | — |
| 0343096000… | 1,000 | = | OPTUS NETWORKS PTY LIMITED | 24/07/2012 | — |
| 0343101000… | 1,000 | = | SYMBIO NETWORKS PTY LTD | 06/09/2012 | — |
| 0343105000… | 1,000 | AAPT LIMITED | PIPE NETWORKS PTY LIMITED | 01/07/2014 | 24/03/2026 |
| 0343117400… | 100 | = | VIRTUTEL PTY LTD | 20/12/2015 | — |
| 0343171200… | 100 | = | SOUL PATTINSON TELECOMMUNICATIONS PTY LIMITED | 14/07/2016 | — |
| 0343178000… | 100 | = | NETSIP PTY LTD | 14/02/2018 | — |
| 0343190600… | 100 | = | THE TRUSTEE FOR READING FAMILY TRUST | 21/10/2019 | — |
| 0343196600… | 100 | = | LMGPS LTD | 23/11/2023 | — |
| 0343201000… | 1,000 | = | SYMBIO NETWORKS PTY LTD | 14/11/2019 | — |
| 0343208200… | 100 | = | WHY PAY MORE 4 LESS PTY LTD | 10/05/2018 | — |
| 0343211000… | 1,000 | IVOX PTY LTD | SYMBIO NETWORKS PTY LTD | 19/12/2017 | 27/12/2017 |
| 0343217000… | 3,000 | = | TELSTRA LIMITED | 23/12/2016 | — |
| 0343220000… | 1,000 | = | PRIMUS TELECOMMUNICATIONS PTY LIMITED | 15/03/2017 | — |
| 0343280200… | 100 | TWILIO AUSTRALIA PTY LTD | SYMBIO NETWORKS PTY LTD | 24/09/2020 | 24/02/2021 |
| 0343287700… | 100 | = | NETSIP PTY LTD | 26/10/2021 | — |
| 0343299000… | 1,000 | = | SOUL PATTINSON TELECOMMUNICATIONS PTY LIMITED | 17/06/2021 | — |
| 0343307500… | 100 | = | CHECK TECHNOLOGY GROUP PTY LTD | 31/01/2022 | — |
| 0343321000… | 1,000 | = | NETSIP PTY LTD | 02/06/2022 | — |
| 0343323000… | 1,000 | = | NETSIP PTY LTD | 02/06/2022 | — |
| 0343327000… | 1,000 | AAPT LIMITED | PIPE NETWORKS PTY LIMITED | 29/05/2023 | 24/03/2026 |
| 0343364000… | 1,000 | = | SYMBIO NETWORKS PTY LTD | 19/06/2020 | — |
| 0343365300… | 100 | = | C2A INTERNET.COM.AU PTY. LTD. | 13/07/2023 | — |
| 0343381100… | 100 | = | PIVOTEL SATELLITE PTY LIMITED | 16/04/2025 | — |
| 0343387000… | 1,000 | = | SYMBIO NETWORKS PTY LTD | 25/09/2023 | — |
| 0343395900… | 100 | = | ADARGA PTY LTD | 16/09/2025 | — |
| 0343407700… | 100 | = | NETERA PTY LTD | 24/10/2025 | — |
| 0343421500… | 100 | = | SYMBIO NETWORKS PTY LTD | 19/08/2026 | — |
| 0343441000… | 3,000 | = | OPTUS NETWORKS PTY LIMITED | 05/10/2009 | — |
| 0343740000… | 3,000 | = | OPTUS NETWORKS PTY LIMITED | 20/06/2019 | — |
| 0353026000… | 1,000 | IPTEL PTY LIMITED | SOUL PATTINSON TELECOMMUNICATIONS PTY LIMITED | 30/03/2000 | 01/12/2004 |
| 0353105000… | 100 | = | OPTUS NETWORKS PTY LIMITED | 12/11/2004 | — |
| 0353105100… | 100 | OPTUS NETWORKS PTY LIMITED | SYMBIO NETWORKS PTY LTD | 12/11/2004 | 17/06/2011 |
| 0353105200… | 800 | = | OPTUS NETWORKS PTY LIMITED | 12/11/2004 | — |
| 0353149000… | 1,000 | ENGIN PTY LIMITED | PRIMUS TELECOMMUNICATIONS PTY LIMITED | 24/12/2004 | 11/08/2015 |
| 0353197100… | 100 | = | PRIMUS TELECOMMUNICATIONS PTY LIMITED | 23/05/2005 | — |
| 0353197200… | 100 | GOTALK LIMITED | SYMBIO NETWORKS PTY LTD | 22/06/2005 | 09/08/2013 |
| 0353197400… | 100 | = | AGILE PTY LTD | 03/04/2007 | 03/09/2012 |
| 0353197500… | 100 | = | SYMBIO NETWORKS PTY LTD | 10/08/2010 | — |
| 0353197600… | 100 | IVOX PTY LTD | SYMBIO NETWORKS PTY LTD | 18/06/2012 | 06/06/2014 |
| 0353197700… | 100 | AAPT LIMITED | PIPE NETWORKS PTY LIMITED | 03/09/2012 | 24/03/2026 |
| 0353470000… | 1,000 | = | OPTUS NETWORKS PTY LIMITED | 20/06/2005 | — |
| 0353620000… | 7,000 | = | TELSTRA LIMITED | 30/06/1991 | — |
| 0353728000… | 1,000 | = | CHIME COMMUNICATIONS PTY LTD | 14/07/2004 | — |
| 0353793000… | 2,000 | = | OPTUS MOBILE PTY LIMITED | 08/10/2007 | — |
| 0353810000… | 20,000 | = | TELSTRA LIMITED | 30/06/1991 | — |
| 0353840000… | 1,000 | = | TELSTRA LIMITED | 30/06/1991 | — |
| 0353842000… | 3,000 | = | TELSTRA LIMITED | 30/06/1991 | — |
| 0353846000… | 3,000 | = | TELSTRA LIMITED | 30/06/1991 | — |
| 0353955000… | 1,000 | VOCUS PTY LTD | OPTUS NETWORKS PTY LIMITED | 20/06/2008 | — |
Numbering areas next to Horsham in the register
Immediately above Horsham's blocks in the 0343… and 0353… prefixes sit Stawell, Daylesford, Mount Wallace, Bacchus Marsh, Ballarat and Yaapeet.
| Numbering area | First block | Blocks | Carriers |
|---|---|---|---|
| Stawell | 0343010000… | 37 | 19 |
| Daylesford | 0343011000… | 32 | 19 |
| Mount Wallace | 0343012000… | 29 | 19 |
| Bacchus Marsh | 0343014000… | 42 | 19 |
| Ballarat | 0343015000… | 99 | 20 |
| Yaapeet | 0343018000… | 30 | 19 |
Had a call from a Horsham number?
No clear pattern in reports on these numbers yet. If a call worried you:
- Call back on a number you trust
If a caller says they're your bank, the ATO, Services Australia, a courier or your telco, hang up and ring the organisation on the number from its website or your statement, never the number that called you. Caller ID can be faked.
- Report the call to Scamwatch
The National Anti-Scam Centre uses Scamwatch reports to warn others and to get scam numbers blocked. Note the number, the time and what the caller claimed to be. If anyone is in danger, call 000.
- Register on the Do Not Call Register
Registering landlines and mobiles is free and stops most telemarketing calls within 30 days. Charities, political parties, surveys and scammers aren't covered.
- If you lost money or shared details
Call your bank straight away on the number on your card and ask it to stop the payment. Then report it through ReportCyber, which passes cybercrime reports to Victoria Police. If your identity documents or passwords were shared, IDCARE's free support service can help you lock things down.
Nationally, Scamwatch recorded $72.5 million lost to scams that started with a phone call in 2025 (down from $107.2 million), with a median loss of $3,800 per report that lost money, and phone-call scam reports are 73.7% below their 2021 level. Telcos blocked 109.3 million scam calls and 45.2 million scam texts in January to March 2026. Sources: Targeting scams 2025 (National Anti-Scam Centre); ACMA quarterly report, Jan–Mar 2026.
Horsham numbers: questions and answers
Where is the Horsham numbering area?
Horsham is in Victoria, in the Horsham council area. The nearest other numbering areas are Kalkee (19 km), Natimuk (23 km) and Laharum (26 km).
What area code does Horsham use?
Horsham numbers use area code 03. Its register blocks start with 03 43 and 03 53. From overseas, drop the 0 and dial +61 3 followed by the eight-digit local number.
What time zone is Horsham in?
Horsham is on Australian Eastern Time (AEST, UTC+10), with daylight saving (AEDT, UTC+11) from the first Sunday in October to the first Sunday in April.
Which carriers hold Horsham phone numbers?
The ACMA register lists 19 carriers with allocated blocks in Horsham. By allocated numbers the largest are Telstra (49.3%), Optus Networks (26.5%) and Symbio Networks (7.5%). A number can since have been ported to another provider.
When were Horsham numbers first allocated?
The oldest block on record for Horsham was allocated on 30 June 1991 and is held by Telstra; the newest on 19 August 2026, to Symbio Networks.
How do I report a scam call from a Horsham number?
Report it to Scamwatch. If you lost money, call your bank first, then report it through ReportCyber, which passes it to Victoria Police. Unwanted sales calls go to the Do Not Call Register's complaint form (1300 792 958).
Check a number from Horsham
Scammers spoof local landline numbers to look nearby. Guides: Australian area codes, how caller ID spoofing works.