Malmesbury · area code 01666 · Ofcom snapshot published 23 Sep 2026

01666 area code — Malmesbury: who called, who holds the numbers

Name: 01666 area code — Ofcom numbering snapshot values, published 23 Sep 2026
Creator: Rangecheck
License: https://rangecheck.co.uk/data-licence/

What does the 01666 register show?

01666 is the area code for Malmesbury. In the Ofcom numbering snapshot published 23 Sep 2026, 470,000 of its 1,000,000 numbers are allocated, in 110 blocks listed to 88 holders — above the median active UK code (446,000). 2.0% of its numbers are quarantined: withdrawn by a provider and held before reuse. Check the number below.

470,000Numbers allocated · median active UK code 446,000

88Listed holders · median 88

47.0%Of this code's number space · all UK geographic ranges 23.8%

0Blocks changed since 19 Aug 2026 · median 0

A range holder is the company Ofcom lists for a block of numbers, usually a network or wholesale provider that supplies many businesses. It is not evidence about the range holder or caller, and a displayed caller ID is not proof of who called. If a number rang once and cut off, do not call back.

01666 numbers: 01666 followed by six digits · 1 blocks with an allocation date in the last 12 months

Snapshot published 23 Sep 2026, fetched 2026-09-24 18:00 UTC · release 6d60d6b0 · this page: unchanged in this release

Places Ofcom lists for area code 01666
Place	Source
Malmesbury	Ofcom area-code table

Source: Ofcom numbering data s1.csv, published 23 Sep 2026, fetched 2026-09-24 18:00 UTC, sha256 002caad0 · n = 370 blocks · method: block capacity from number length · release 6d60d6b0 · CSV

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Check the number privately

Enter a number below. The lookup runs privately in your browser and returns the Ofcom block status with a callback rule.

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Enter the number that called

Your full number does not leave this page. A lookup downloads only the relevant four-digit prefix-class file.

Private number check and source
Lookup	Method
Ofcom block	Private lookup in this browser

Source: Ofcom numbering data s1.csv, published 23 Sep 2026, fetched 2026-09-24 18:00 UTC, sha256 002caad0 · n = 370 blocks · method: local prefix shard · release 6d60d6b0 · CSV

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What should I do after a suspicious call from a 01666 number?

What should I do after a suspicious call from a 01666 number?
Step	Action
1	Do not call back a number you cannot identify. If it rang once and cut off, that is often a test that your line is live.
2	If the caller said they were your bank, a company or the police, hang up and phone the organisation on a number you find yourself, or call 159 for your bank.
3	Forward suspicious text messages to 7726, free of charge.
4	If you lost money or shared details, contact your bank at once and report to Action Fraud (England, Wales and Northern Ireland) or Police Scotland.
5	For unwanted marketing calls, report to the ICO and block the number on your phone.
6	Calls to 01 and 02 numbers are charged at your provider’s standard landline rate (gov.uk/call-charges).

Source: Ofcom numbering data s1.csv, published 23 Sep 2026, fetched 2026-09-24 18:00 UTC, sha256 002caad0 · n = 370 blocks · method: aggregate register blocks by area code · release 6d60d6b0 · CSV

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Who holds the 01666 number ranges?

In the snapshot published 23 Sep 2026, 88 listed holders share the 110 allocated blocks of 01666 (470,000 numbers). The list is alphabetical: it shows who administers each block, not who calls from it. Ofcom-listed range allocation holders in the 23 Sep 2026 snapshot; not evidence about the range holder or caller.

Listed holders of 01666 blocks, alphabetical, snapshot published 23 Sep 2026. A range holder is the provider Ofcom lists for a block; it is not evidence of who called.
Range holder (Ofcom-listed; not evidence of who called)	Blocks	Numbers	Earliest allocation date recorded
(AQ) LIMITED	1	10,000	2012-09-12
24 Seven Cloud Communications Ltd	1	1,000	2020-01-17
8x8 Communications UK Limited	1	1,000	2012-04-05
Adepteo Limited	1	1,000	2017-01-17
Andrews & Arnold (Numbers) Ltd	1	10,000	2009-03-27
AQL Wholesale Ltd	1	10,000	2004-11-01
Atomstream Limited	1	1,000	2010-05-14
Barritel Limited	1	10,000	2007-06-26

All 88 rows

Listed holders of 01666 blocks, alphabetical, snapshot published 23 Sep 2026. A range holder is the provider Ofcom lists for a block; it is not evidence of who called.
Range holder (Ofcom-listed; not evidence of who called)	Blocks	Numbers	Earliest allocation date recorded
(AQ) LIMITED	1	10,000	2012-09-12
24 Seven Cloud Communications Ltd	1	1,000	2020-01-17
8x8 Communications UK Limited	1	1,000	2012-04-05
Adepteo Limited	1	1,000	2017-01-17
Andrews & Arnold (Numbers) Ltd	1	10,000	2009-03-27
AQL Wholesale Ltd	1	10,000	2004-11-01
Atomstream Limited	1	1,000	2010-05-14
Barritel Limited	1	10,000	2007-06-26
Belgacom International Carrier Services SA	1	1,000	2020-04-09
Bicom Systems EURL	1	1,000	2012-03-01
Bink Networks Ltd	1	1,000	2023-04-11
BT	10	100,000	1994-07-15
Calltracks Limited	1	1,000	2014-01-31
CFL Communications Ltd	1	10,000	2009-07-14
Colt Technology Services	2	2,000	2016-06-20
Content Guru Limited	1	1,000	2012-10-12
Convergence Group (wireless) Networks Limited	1	1,000	2019-05-21
Dial 9 Communications Limited	1	1,000	2019-12-10
DIDWW Ireland Limited	1	1,000	2019-01-21
Digital Space Group Limited	2	11,000	2008-05-16
Digitech Solutions Global Limited	1	1,000	2010-04-27
EVE CONNECT LTD	1	1,000	2022-06-15
Flextel Limited	1	10,000	2005-11-23
Fuse 2 Communications Ltd	1	1,000	2017-07-03
Gamma Telecom Holdings Limited	1	10,000	2005-05-04
GCI Network Solutions Limited	3	12,000	2017-04-26
Hello Telecom (UK) Limited	1	1,000	2011-11-17
I.T Communications Limited	1	1,000	2016-02-01
ICC Networks Ltd	1	1,000	2012-04-16
ICUK Computing Services Limited	1	1,000	2020-06-17
Inet Telecoms Ltd (Voipfone)	1	1,000	2011-10-17
INTELLIGENT EXCHANGES LIMITED	1	1,000	2026-01-26
Internexus Networks Limited	1	1,000	2011-11-22
Invade International Ltd	1	10,000	2016-01-21
Invoco Ltd	1	1,000	2012-04-03
Invosys Limited	1	1,000	2012-05-17
IOVOX Limited	1	1,000	2014-03-27
IP Voice Networks Ltd	1	1,000	2017-09-20
IV Response Limited	1	10,000	2005-07-25
Kalnet4U Ltd	1	1,000	2013-05-30
KCOM Group Ltd	1	1,000	2022-09-08
Linear Telecoms Limited	1	1,000	2010-10-14
Localphone Limited	1	10,000	2007-05-10
Lumen Technologies UK Limited	1	10,000	2009-08-14
Magrathea Telecommunications Limited	1	10,000	2004-11-19
Mars Communications Limited	1	10,000	2009-02-05
Media Hawk Ltd	1	1,000	2013-04-10
Mi Telecom Limited	1	1,000	2020-07-03
Minotaur Telecom Limited	1	1,000	2013-02-04
Nationwide Telephone Assistance Ltd	1	10,000	2007-10-02
Net-Work Internet Ltd	1	10,000	2008-05-28
Nexbridge Communications Limited	1	1,000	2012-03-09
Nexus Telecommunications Limited	1	10,000	2009-06-11
Nodemax Limited	1	10,000	2008-07-09
Number Services Ltd.	1	1,000	2018-11-22
Nuso Cloud UK Limited	1	1,000	2013-07-03
Orbtalk Limited	1	1,000	2012-02-23
Phone Co-Op Numbering Limited	1	1,000	2010-12-23
Redcentric Solutions Limited	1	10,000	2015-06-05
Redwood Technologies Ltd	1	1,000	2018-11-15
Served Up Limited	1	10,000	2008-10-16
Simwood eSMS Limited	1	1,000	2010-08-03
Six Degrees Technology Group Limited	1	1,000	2020-01-15
Sky UK Limited	2	2,000	2013-07-01
Solutios Limited	1	10,000	2008-11-20
Spitfire Network Services Limited	1	1,000	2011-11-11
Suretec Systems Ltd	1	1,000	2010-05-07
TalkTalk Communications Limited	2	2,000	2012-01-20
Telappliant Limited	1	1,000	2010-06-21
Telecom2 Limited	1	10,000	2009-09-11
Telecoms World Direct Limited	1	10,000	2009-04-28
Telephone Box Limited	1	1,000	2010-12-15
TelNG Limited	1	10,000	2007-02-28
Truespeed Communications Ltd	1	1,000	2023-04-14
TTNC Limited	1	10,000	2013-11-12
Verizon UK Limited	1	10,000	2004-12-03
Virgin Media Limited	1	1,000	2017-03-03
Vodafone Ltd (C&W)	8	17,000	2013-09-09
Voiceflex Limited	1	10,000	2007-09-27
VoiceHost Limited	1	1,000	2010-10-05
VoIP-Un Limited	1	10,000	2007-11-01
Voxbone SA	1	1,000	2011-12-09
VOXYONDER NETWORK SERVICES UK LTD	1	1,000	2020-09-10
Windsor Telecom Limited	1	1,000	2010-07-22
XoverX Ltd	1	1,000	2013-04-30
YayYay Limited	1	1,000	2015-04-24
Zapappi Ltd	1	1,000	2018-01-05
Ziron Limited	1	1,000	2012-07-31

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Is a 01666 number real, and what does “Quarantined” mean?

Of the 1,000,000 numbers in 01666, 47.0% are allocated (470,000), 50.1% protected, 0.9% free and 2.0% quarantined in the snapshot published 23 Sep 2026, against 23.8% allocated across all UK geographic ranges. Quarantined means withdrawn and held before reuse, not never allocated; a block’s status does not tell whether one particular number is in service.

100% stacked bar: 01666 number status by numbers, 47.0% allocated vs 23.8% across all UK geographic ranges, Ofcom snapshot published 23 Sep 2026 — Number status in 01666 by numbers and blocks, snapshot published 23 Sep 2026; shares sum to 100% · Ofcom · 23 Sep 2026

Number status in 01666 by numbers and blocks, snapshot published 23 Sep 2026; shares sum to 100%
Status	Numbers	Blocks
Allocated	470,000	110
Protected	501,000	249
Free	9,000	9
Quarantined	20,000	2
Other (Reserved or Designated)	0	0

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Has anything changed in the 01666 ranges, and which blocks were allocated recently?

Between the weekly Ofcom files fetched on 19 Aug 2026 and 24 Sep 2026 (5 weekly transitions), none of the 370 register blocks of 01666 changed status, holder or listing; the median active code also shows none. Separately, 1 blocks of 01666 have an allocation date in the last 12 months. Block changes are not the same as a number being cut off or ported.

Ofcom: “Please note that transferred numbers will also be shown as ‘allocated’.” (numbering data, ofcom.org.uk, retrieved 24 Sep 2026)

Weekly register changes for 01666 blocks, 19 Aug 2026 – 24 Sep 2026; a block with several changes counts once
Weekly transition	Changed blocks
2026-08-19 – 2026-08-26	0
2026-08-26 – 2026-09-02	0
2026-09-02 – 2026-09-09	0
2026-09-09 – 2026-09-16	0
2026-09-16 – 2026-09-24	0

01666 blocks with an allocation date in the last 12 months, snapshot published 23 Sep 2026 · 1 rows

01666 blocks with an allocation date in the last 12 months, snapshot published 23 Sep 2026
Block	Recorded allocation date	Listed holder
1666 72 4	2026-01-26	INTELLIGENT EXCHANGES LIMITED

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Since when have 01666 numbers been allocated?

The earliest allocation date recorded for 01666 blocks is 1994, the register’s baseline year, shared by 578 of 599 active codes. Of 110 allocated blocks, 22 carry a date from 2020 onwards. Recorded dates are provisional: a block that moved to another provider may show the date of that move rather than its first allocation.

histogram: 01666 allocated blocks by allocation year, earliest 1994 vs median 1994, 110 blocks, snapshot published 23 Sep 2026 — Allocated 01666 blocks by recorded allocation year, snapshot published 23 Sep 2026 · Ofcom · 23 Sep 2026

Allocated 01666 blocks by recorded allocation year, snapshot published 23 Sep 2026
Recorded years	Allocated blocks
1994–1999	10
2000–2004	3
2005–2009	21
2010–2014	37
2015–2019	17
2020–2024	21
2025–2029	1

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How many digits does a 01666 number have?

Every allocated 01666 block carries 11-digit numbers: 01666 followed by 6 digits. No 10-digit blocks are listed in this code.

How many digits does a 01666 number have?
National number length	Allocated blocks
11	110

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Which area codes are next to 01666 in the numbering plan?

Codes next to 01666 by number, not necessarily nearby on the map: the Ofcom table carries no coordinates.

Area codes adjacent to 01666 by number, with places from Ofcom’s area-code table
Code	Places	Allocated numbers	Listed holders
01664	Melton Mowbray	482,000	87
01665	Alnwick	450,000	89
01667	Nairn	368,000	79
01668	Bamburgh	337,000	79

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Where do these numbers come from, and how do I cite this page?

Contains Ofcom copyright material: Telephone area codes (ofcom.org.uk), retrieved 24 Sep 2026. Contains public sector information licensed under the Open Government Licence v3.0.

Rangecheck, “01666 area code — Ofcom numbering snapshot published 23 Sep 2026”, release 6d60d6b0, https://rangecheck.co.uk/area-codes/01666/, retrieved 24 Sep 2026. Contains Ofcom copyright material: numbering data and Telephone area codes (ofcom.org.uk).
Field	Value
Release	6d60d6b0
Source published	23 Sep 2026
Source fetched	2026-09-24 18:00 UTC

How to cite · Rangecheck, “01666 area code — Ofcom numbering snapshot published 23 Sep 2026”, release 6d60d6b0, https://rangecheck.co.uk/area-codes/01666/, retrieved 24 Sep 2026. Contains Ofcom copyright material: numbering data and Telephone area codes (ofcom.org.uk). Contains Ofcom copyright material: Telephone area codes (ofcom.org.uk), retrieved 24 Sep 2026. Contains public sector information licensed under the Open Government Licence v3.0.

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