Hamilton: landline numbers and carriers

Hamilton is one of the town-level numbering areas the ACMA register uses under area code 03 (VIC & TAS). The register lists 39 number blocks for it with about 62,100 allocated numbers, held by 19 carriers and spread over the 0355… and 0345… dialling prefixes. That makes Hamilton the 41st largest of 475 numbering areas under 03 by block count, with 0.18% of the area code's allocated numbers. A landline that calls you from one of these blocks was issued for the Hamilton area — though the line may since have been ported, and caller ID can be spoofed.

Source: ACMA register, data as of 16/10/2026

39blocks in the register
19carriers with allocations
62,100allocated numbers
1991first allocation

Where Hamilton is

State or territory
Victoria
Council area
Southern Grampians
Local time
— AEST, UTC+10; AEDT, UTC+11 in summer
Number format
03 55xx xxxx; from overseas +61 3 55xx xxxx
Nearest numbering areas
Tahara (25 km), Wallacedale (28 km), Cavendish (29 km), Penshurst (31 km), Dunkeld (32 km)

Locality, council and state: ABS ASGS Edition 3 (CC BY 4.0). Distances are straight-line between localities.

Map of the Hamilton numbering area in Victoria and the nearest other numbering areas
Shaded: Southern Grampians council area. The ACMA doesn't publish numbering-area boundaries, so the dot marks the Hamilton locality rather than an exact outline; the inset shows where the map sits in Australia. Boundaries: ABS (CC BY 4.0).

How Hamilton was numbered

The oldest block in Hamilton 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 — 8 of 39 — date from 2015–2019, but allocations here span 35 years. 13 of the blocks are the standard 1,000-number size, 21 are 100-number blocks of the kind the ACMA has issued to VoIP and wholesale carriers since the mid-2000s, and 2 are 10,000 numbers or larger. 8 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.

PeriodBlocks allocated
1990–19944
2000–20044
2005–20097
2010–20144
2015–20198
2020–20247
2025–20295

The carriers in Hamilton

TELSTRA LIMITED holds the largest share here with 69.2% of allocated numbers across 4 blocks; SYMBIO NETWORKS PTY LTD is second with 5.6%, 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. SYMBIO NETWORKS PTY LTD (3), OPTUS NETWORKS PTY LIMITED (1) and PRIMUS TELECOMMUNICATIONS PTY LIMITED (1) hold blocks originally allocated to another carrier.

CarrierBlocksNumbersShareFirst blockLatest block
TELSTRA LIMITED443,00069.2%30/06/199130/06/1991
SYMBIO NETWORKS PTY LTD83,5005.6%23/06/200519/08/2026
OPTUS NETWORKS PTY LIMITED43,1005%12/11/200424/07/2012
PRIMUS TELECOMMUNICATIONS PTY LIMITED43,1005%24/12/200415/03/2017
SOUL PATTINSON TELECOMMUNICATIONS PTY LIMITED23,1005%30/03/200014/07/2016
OPTUS MOBILE PTY LIMITED12,0003.2%31/10/200731/10/2007
NETSIP PTY LTD31,2001.9%14/02/201810/07/2026
PIPE NETWORKS PTY LIMITED21,1001.8%03/07/200701/05/2014
CHIME COMMUNICATIONS PTY LTD11,0001.6%14/07/200414/07/2004
ADARGA PTY LTD11000.2%16/09/202516/09/2025
AGILE PTY LTD11000.2%03/04/200703/04/2007
C2A INTERNET.COM.AU PTY. LTD.11000.2%13/07/202313/07/2023
CHECK TECHNOLOGY GROUP PTY LTD11000.2%31/01/202231/01/2022
LMGPS LTD11000.2%23/11/202323/11/2023
NETERA PTY LTD11000.2%24/10/202524/10/2025
PIVOTEL SATELLITE PTY LIMITED11000.2%16/04/202516/04/2025
THE TRUSTEE FOR READING FAMILY TRUST11000.2%21/10/201921/10/2019
VIRTUTEL PTY LTD11000.2%20/12/201520/12/2015
WHY PAY MORE 4 LESS PTY LTD11000.2%10/05/201810/05/2018

Number blocks registered for Hamilton

Every registered block for this area is allocated to a carrier. All 39 blocks, ascending:

Block startNumbersOriginal allocateeCurrent holderAllocatedTransferred
0345024000…2,000=OPTUS MOBILE PTY LIMITED31/10/2007—
0345051000…1,000=OPTUS NETWORKS PTY LIMITED24/07/2012—
0345057100…100=VIRTUTEL PTY LTD20/12/2015—
0345100200…100=SOUL PATTINSON TELECOMMUNICATIONS PTY LIMITED14/07/2016—
0345106300…100=NETSIP PTY LTD14/02/2018—
0345117500…100=THE TRUSTEE FOR READING FAMILY TRUST21/10/2019—
0345127500…100=ADARGA PTY LTD16/09/2025—
0345137700…100=WHY PAY MORE 4 LESS PTY LTD10/05/2018—
0345145700…100TWILIO AUSTRALIA PTY LTDSYMBIO NETWORKS PTY LTD24/09/202024/02/2021
0345189800…100=NETSIP PTY LTD26/10/2021—
0345201900…100=CHECK TECHNOLOGY GROUP PTY LTD31/01/2022—
0345215000…100=C2A INTERNET.COM.AU PTY. LTD.13/07/2023—
0345222000…1,000=SYMBIO NETWORKS PTY LTD19/06/2020—
0345225100…100=LMGPS LTD23/11/2023—
0345237200…100=PIVOTEL SATELLITE PTY LIMITED16/04/2025—
0345241000…1,000=SYMBIO NETWORKS PTY LTD04/09/2024—
0345249300…100=NETERA PTY LTD24/10/2025—
0345259000…1,000=NETSIP PTY LTD10/07/2026—
0345263400…100=SYMBIO NETWORKS PTY LTD19/08/2026—
0355007000…1,000=OPTUS NETWORKS PTY LIMITED12/11/2004—
0355080000…3,000IPTEL PTY LIMITEDSOUL PATTINSON TELECOMMUNICATIONS PTY LIMITED30/03/200001/12/2004
0355199000…1,000ENGIN PTY LIMITEDPRIMUS TELECOMMUNICATIONS PTY LIMITED24/12/200411/08/2015
0355316000…1,000=CHIME COMMUNICATIONS PTY LTD14/07/2004—
0355349500…100AAPT LIMITEDPIPE NETWORKS PTY LIMITED03/07/200724/03/2026
0355379100…100=PRIMUS TELECOMMUNICATIONS PTY LIMITED24/05/2005—
0355379200…100GOTALK LIMITEDSYMBIO NETWORKS PTY LTD23/06/200523/08/2013
0355379400…100=AGILE PTY LTD03/04/200703/09/2012
0355379500…100IVOX PTY LTDSYMBIO NETWORKS PTY LTD18/06/201223/06/2014
0355379600…100=SYMBIO NETWORKS PTY LTD24/04/2014—
0355379900…100VOCUS PTY LTDOPTUS NETWORKS PTY LIMITED20/06/2008—
0355452000…1,000=OPTUS NETWORKS PTY LIMITED27/04/2007—
0355510000…10,000=TELSTRA LIMITED30/06/1991—
0355710000…30,000=TELSTRA LIMITED30/06/1991—
0355744000…2,000=TELSTRA LIMITED30/06/1991—
0355770000…1,000=TELSTRA LIMITED30/06/1991—
0355795000…1,000AAPT LIMITEDPIPE NETWORKS PTY LIMITED01/05/201424/03/2026
0355974000…1,000=PRIMUS TELECOMMUNICATIONS PTY LIMITED15/03/2017—
0355990000…1,000=PRIMUS TELECOMMUNICATIONS PTY LIMITED15/03/2017—
0355999000…1,000=SYMBIO NETWORKS PTY LTD16/04/2015—

Numbering areas next to Hamilton in the register

Immediately below and above Hamilton's blocks in the 0355… and 0345… prefixes sit Tahara, Victoria Valley, Wallacedale, Wombelano, Camperdown, Dartmoor, Mount Richmond, Benayeo, Ozenkadnook, Poolaijelo, Balmoral and Harrow.

Numbering areaFirst blockBlocksCarriers
Tahara0345012000…3219
Victoria Valley0345014000…3119
Wallacedale0345016000…2919
Wombelano0345018000…2919
Camperdown0345020000…3118
Dartmoor0345022000…2818
Mount Richmond0345026000…3018
Benayeo0345028000…2718
Ozenkadnook0345030000…2819
Poolaijelo0345032000…2819
Balmoral0345034000…2918
Harrow0345036000…2718

Had a call from a Hamilton number?

No clear pattern in reports on these numbers yet. If a call worried you:

  1. 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.

  2. 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.

    Report to Scamwatch ↗

  3. 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.

    Do Not Call Register ↗

  4. 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.

    ReportCyber ↗IDCARE ↗

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.

Hamilton numbers: questions and answers

Where is the Hamilton numbering area?

Hamilton is in Victoria, in the Southern Grampians council area. The nearest other numbering areas are Tahara (25 km), Wallacedale (28 km) and Cavendish (29 km).

What area code does Hamilton use?

Hamilton numbers use area code 03. Its register blocks start with 03 55 and 03 45. From overseas, drop the 0 and dial +61 3 followed by the eight-digit local number.

What time zone is Hamilton in?

Hamilton 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 Hamilton phone numbers?

The ACMA register lists 19 carriers with allocated blocks in Hamilton. By allocated numbers the largest are Telstra (69.2%), Symbio Networks (5.6%) and Optus Networks (5%). A number can since have been ported to another provider.

When were Hamilton numbers first allocated?

The oldest block on record for Hamilton 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 Hamilton 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 Hamilton

Scammers spoof local landline numbers to look nearby. Guides: Australian area codes, how caller ID spoofing works.