Kalkadoon (Ext): landline numbers and carriers

Kalkadoon (Ext) is one of the town-level numbering areas the ACMA register uses under area code 07 (QLD). The register lists 32 number blocks for it with about 20,000 allocated numbers, held by 18 carriers and spread over the 0744… and 0747… dialling prefixes. That makes Kalkadoon (Ext) the 110th largest of 409 numbering areas under 07 by block count, with 0.09% of the area code's allocated numbers. A landline that calls you from one of these blocks was issued for the Kalkadoon (Ext) area — though the line may since have been ported, and caller ID can be spoofed.

Source: ACMA register, data as of 15/10/2026

32blocks in the register
18carriers with allocations
20,000allocated numbers
1991first allocation

Where Kalkadoon (Ext) is

State or territory
Queensland
Council area
Mount Isa
ABS locality
Kalkadoon (the numbering area is named after a place near here)
Local time
— AEST, UTC+10, no daylight saving
Number format
07 44xx xxxx; from overseas +61 7 44xx xxxx
Nearest numbering areas
Mount Isa (21 km), Gunpowder (101 km), Barkly (Ext) (102 km), Cloncurry (112 km), Camooweal (147 km)

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

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

How Kalkadoon (Ext) was numbered

The oldest block in Kalkadoon (Ext) 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 — 7 of 32 — date from 2015–2019, but allocations here span 35 years. 8 of the blocks are the standard 1,000-number size, 20 are 100-number blocks of the kind the ACMA has issued to VoIP and wholesale carriers since the mid-2000s. 6 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 and TWILIO AUSTRALIA PTY LTD as original allocatees of blocks now held by other carriers.

PeriodBlocks allocated
1990–19943
1995–19991
2000–20043
2005–20094
2010–20144
2015–20197
2020–20246
2025–20294

The carriers in Kalkadoon (Ext)

Kalkadoon (Ext) is spread across carriers: TELSTRA LIMITED leads with 35% of allocated numbers ahead of SOUL PATTINSON TELECOMMUNICATIONS PTY LIMITED on 15.5%, and 18 carriers hold blocks in total. TELSTRA LIMITED has the longest tenure, with a block dated 30/06/1991; SYMBIO NETWORKS PTY LTD received the newest, on 19/08/2026. SOUL PATTINSON TELECOMMUNICATIONS PTY LIMITED (1), SYMBIO NETWORKS PTY LTD (3) and PRIMUS TELECOMMUNICATIONS PTY LIMITED (1) hold blocks originally allocated to another carrier.

CarrierBlocksNumbersShareFirst blockLatest block
TELSTRA LIMITED47,00035%30/06/199104/07/1996
SOUL PATTINSON TELECOMMUNICATIONS PTY LIMITED23,10015.5%30/03/200014/07/2016
SYMBIO NETWORKS PTY LTD72,50012.5%22/06/200519/08/2026
OPTUS NETWORKS PTY LIMITED22,00010%16/01/200601/02/2018
OPTUS MOBILE PTY LIMITED12,00010%23/09/200823/09/2008
PRIMUS TELECOMMUNICATIONS PTY LIMITED31,2006%24/12/200403/02/2012
CHIME COMMUNICATIONS PTY LTD11,0005%14/07/200414/07/2004
NETSIP PTY LTD22001%14/02/201826/10/2021
ADARGA PTY LTD11000.5%16/09/202516/09/2025
C2A INTERNET.COM.AU PTY. LTD.11000.5%13/07/202313/07/2023
CHECK TECHNOLOGY GROUP PTY LTD11000.5%31/01/202231/01/2022
LMGPS LTD11000.5%23/11/202323/11/2023
NETERA PTY LTD11000.5%24/10/202524/10/2025
PIPE NETWORKS PTY LIMITED11000.5%03/09/201203/09/2012
PIVOTEL SATELLITE PTY LIMITED11000.5%16/04/202516/04/2025
THE TRUSTEE FOR READING FAMILY TRUST11000.5%21/10/201921/10/2019
VIRTUTEL PTY LTD11000.5%20/12/201520/12/2015
WHY PAY MORE 4 LESS PTY LTD11000.5%10/05/201810/05/2018

Number blocks registered for Kalkadoon (Ext)

Every registered block for this area is allocated to a carrier. All 32 blocks, ascending:

Block startNumbersOriginal allocateeCurrent holderAllocatedTransferred
0744035000…2,000=OPTUS MOBILE PTY LIMITED23/09/2008—
0744141100…100=VIRTUTEL PTY LTD20/12/2015—
0744160000…1,000=SYMBIO NETWORKS PTY LTD30/05/2016—
0744190400…100=SOUL PATTINSON TELECOMMUNICATIONS PTY LIMITED14/07/2016—
0744195700…100=NETSIP PTY LTD14/02/2018—
0744256300…100=THE TRUSTEE FOR READING FAMILY TRUST21/10/2019—
0744280300…100=ADARGA PTY LTD16/09/2025—
0744290900…100=WHY PAY MORE 4 LESS PTY LTD10/05/2018—
0744298900…100TWILIO AUSTRALIA PTY LTDSYMBIO NETWORKS PTY LTD24/09/202024/02/2021
0744403500…100=NETSIP PTY LTD26/10/2021—
0744473800…100=CHECK TECHNOLOGY GROUP PTY LTD31/01/2022—
0744475000…1,000=OPTUS NETWORKS PTY LIMITED01/02/2018—
0744538100…100=C2A INTERNET.COM.AU PTY. LTD.13/07/2023—
0744546400…100=LMGPS LTD23/11/2023—
0744566700…100=PIVOTEL SATELLITE PTY LIMITED16/04/2025—
0744584000…100=NETERA PTY LTD24/10/2025—
0744587000…1,000=SYMBIO NETWORKS PTY LTD19/06/2020—
0744597300…100=SYMBIO NETWORKS PTY LTD19/08/2026—
0747059000…1,000ENGIN PTY LIMITEDPRIMUS TELECOMMUNICATIONS PTY LIMITED24/12/200411/08/2015
0747113000…3,000IPTEL PTY LIMITEDSOUL PATTINSON TELECOMMUNICATIONS PTY LIMITED30/03/200001/12/2004
0747337000…1,000=CHIME COMMUNICATIONS PTY LTD14/07/2004—
0747393100…100=PRIMUS TELECOMMUNICATIONS PTY LIMITED23/05/2005—
0747393200…100GOTALK LIMITEDSYMBIO NETWORKS PTY LTD22/06/200519/08/2013
0747393400…100=SYMBIO NETWORKS PTY LTD24/04/2014—
0747393500…100=PRIMUS TELECOMMUNICATIONS PTY LIMITED03/02/2012—
0747393600…100IVOX PTY LTDSYMBIO NETWORKS PTY LTD18/06/201212/06/2014
0747393700…100AAPT LIMITEDPIPE NETWORKS PTY LIMITED03/09/201224/03/2026
0747425000…3,000=TELSTRA LIMITED30/06/1991—
0747623000…2,000=TELSTRA LIMITED04/07/1996—
0747694000…1,000=TELSTRA LIMITED13/07/1994—
0747696000…1,000=TELSTRA LIMITED13/07/1994—
0747943000…1,000=OPTUS NETWORKS PTY LIMITED16/01/2006—

Numbering areas next to Kalkadoon (Ext) in the register

Immediately below and above Kalkadoon (Ext)'s blocks in the 0744… and 0747… prefixes sit Townsville, Briaba, Mount Isa, Bowen, Bambaroo, Ayr, Hughenden, Burdekin (Ext), Cape River (Ext), Kirk (Ext), Leichhardt Range (Ext) and Charters Towers.

Numbering areaFirst blockBlocksCarriers
Townsville0744015000…10820
Briaba0744019000…3119
Mount Isa0744020000…4719
Bowen0744021000…4519
Bambaroo0744022000…2919
Ayr0744029000…4319
Hughenden0744037000…3319
Burdekin (Ext)0744050000…3119
Cape River (Ext)0744052000…3319
Kirk (Ext)0744054000…3119
Leichhardt Range (Ext)0744056000…3019
Charters Towers0744058000…4119

Had a call from a Kalkadoon (Ext) 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 the Queensland Police Service. 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.

Kalkadoon (Ext) numbers: questions and answers

Where is the Kalkadoon (Ext) numbering area?

Kalkadoon (Ext) is in Queensland, in the Mount Isa council area. It is named after a place near the ABS locality of Kalkadoon. The nearest other numbering areas are Mount Isa (21 km), Gunpowder (101 km) and Barkly (Ext) (102 km).

What area code does Kalkadoon (Ext) use?

Kalkadoon (Ext) numbers use area code 07. Its register blocks start with 07 44 and 07 47. From overseas, drop the 0 and dial +61 7 followed by the eight-digit local number.

What time zone is Kalkadoon (Ext) in?

Kalkadoon (Ext) is on Australian Eastern Time (AEST, UTC+10), with no daylight saving.

Which carriers hold Kalkadoon (Ext) phone numbers?

The ACMA register lists 18 carriers with allocated blocks in Kalkadoon (Ext). By allocated numbers the largest are Telstra (35%), Soul Pattinson Telecommunications (15.5%) and Symbio Networks (12.5%). A number can since have been ported to another provider.

When were Kalkadoon (Ext) numbers first allocated?

The oldest block on record for Kalkadoon (Ext) 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 Kalkadoon (Ext) number?

Report it to Scamwatch. If you lost money, call your bank first, then report it through ReportCyber, which passes it to the Queensland Police Service. Unwanted sales calls go to the Do Not Call Register's complaint form (1300 792 958).

Check a number from Kalkadoon (Ext)

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