01666 Area Code — Malmesbury, Tetbury & Lyneham
01666 is the UK dialling code for Malmesbury in Wiltshire, also serving Tetbury, Lyneham and Lea, allocated by Ofcom under the National Telephone Numbering Plan. Our database has tracked 54 distinct 01666 numbers across 68 public lookups.
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Quick facts
Area code
01666
Location
Malmesbury
County
Wiltshire
Region
South West England
Number type
Geographic landline
Number format
01666 XXX XXX
Operators serving
8+
Call cost
Standard rate
About the 01666 dialling code
01666 is the UK geographic dialling code for Malmesbury, allocated by Ofcom under the National Telephone Numbering Plan. It is used by landlines — and increasingly VoIP lines — registered to the Malmesbury area.
A full Malmesbury number is normally written as 01666 XXXXXX. You can dial the local part on its own from within the same area, or the full number from anywhere in the UK.
Because of UK number portability and internet calling, a 01666 number no longer guarantees the caller is physically in Malmesbury. Fraudsters also "spoof" local codes like 01666 so an unknown call looks like a nearby business or neighbour — so treat an unexpected call on what is actually said, not on the area code alone.
Map of the 01666 dialling area
The marker shows Malmesbury; the shaded circle is an approximate indication of the area the 01666 code serves — exact Ofcom charging-area boundaries are irregular and don't follow a neat radius.
Map data © OpenStreetMap contributors. View larger map
Areas typically served by 01666
Settlements in and around the Malmesbury dialling area that typically use 01666 numbers. Approximate — Ofcom charging-area boundaries don't follow town or county lines exactly, and properties near a boundary may take a neighbouring code.
Calling 01666 from abroad
From outside the UK, dial your international access prefix, then the UK country code 44, then 1666 (the area code without its leading zero) and the local number.
| Calling from | Dial |
|---|---|
| United States & Canada | 011 44 1666 … |
| Europe / most of the world | 00 44 1666 … |
| Australia | 0011 44 1666 … |
| Any mobile phone | +44 1666 … |
History of the 01666 code
The code was 0666 until PhONEday, 16 April 1995, when a "1" was inserted after the leading zero to create 01666.
Top searched 01666 numbers
These are the 01666 numbers most-looked-up by visitors to our number checker. Click any number to see its full lookup page with risk-level, range holder, and community reports.
| Number | Searches | Last looked up |
|---|---|---|
| 01666 822603 | 3 | 7 Jul 2026 |
| 01666 510623 | 3 | 6 Jul 2026 |
| 01666 250022 | 3 | 25 May 2026 |
| 01666 746555 | 2 | 8 Jul 2026 |
| 01666 822595 | 2 | 4 Jul 2026 |
| 01666 330515 | 2 | 3 Jul 2026 |
| 01666 510612 | 2 | 23 Jun 2026 |
| 01666 510617 | 2 | 21 Jun 2026 |
| 01666 822601 | 2 | 19 Jun 2026 |
| 01666 330577 | 2 | 17 Jun 2026 |
| 01666 338870 | 2 | 17 May 2026 |
| 01666 510619 | 1 | 10 Jul 2026 |
| 01666 723736 | 1 | 10 Jul 2026 |
| 01666 725842 | 1 | 10 Jul 2026 |
| 01666 728849 | 1 | 10 Jul 2026 |
| 01666 758100 | 1 | 10 Jul 2026 |
| 01666 755934 | 1 | 9 Jul 2026 |
| 01666 822602 | 1 | 7 Jul 2026 |
| 01666 318642 | 1 | 6 Jul 2026 |
| 01666 318790 | 1 | 6 Jul 2026 |
Is a call from 01666 safe?
Most 01666 calls are ordinary local calls from Malmesbury homes and businesses. The main risk to be aware of is "neighbour spoofing", where a scammer fakes a local 01666 prefix so you are more likely to answer. Never share bank details, passwords or one-time security codes with an unexpected caller, even when the number looks local — hang up and call the organisation back on a number you have verified yourself.
To call a 01666 (Malmesbury) number from outside the UK, drop the leading zero and dial +44 1666 followed by the local number.
Operators serving Malmesbury
These UK communications providers have been allocated 01666 number blocks by Ofcom. The number of blocks per operator gives a rough sense of how widely each provider serves this area.
| Provider (Ofcom-allocated) | Allocated blocks |
|---|---|
| BT | 10 |
| Vodafone Ltd (C&W) | 8 |
| GCI Network Solutions Limited | 3 |
| Verizon UK Limited | 2 |
| Colt Technology Services | 2 |
| TalkTalk Communications Limited | 2 |
| Digital Space Group Limited | 2 |
| Sky UK Limited | 2 |
Ofcom number ranges on 01666
Ofcom's National Numbering Plan lists 370 number blocks under 01666, of which 112 are allocated to 90 communications providers. The first allocated blocks are shown below — look up any full number with the number checker to see its exact range holder.
| Number block | Status | Range holder (Ofcom-allocated) |
|---|---|---|
0166620… | Allocated | TelNG Limited |
0166621… | Allocated | Voiceflex Limited |
0166622… | Allocated | Barritel Limited |
01666238… | Allocated | TalkTalk Communications Limited |
01666239… | Allocated | TalkTalk Communications Limited |
0166625… | Allocated | (AQ) LIMITED |
0166626… | Allocated | Localphone Limited |
0166627… | Allocated | VoIP-Un Limited |
01666280… | Allocated | Fuse 2 Communications Ltd |
01666281… | Allocated | EVE CONNECT LTD |
01666282… | Allocated | Adepteo Limited |
01666283… | Allocated | Zapappi Ltd |
Showing 12 of 112 allocated blocks. Source: Ofcom telephone numbering data, updated weekly.
How to block and report 01666 spam calls
Block or report 01666
- You can block 01666 directly from your recent-calls list on iPhone or Android, and forward scam texts free to 7726.
- Scam or fraud calls should be reported to Action Fraud (0300 123 2040) or Police Scotland (101); persistent marketing calls to the ICO / TPS.
Full step-by-step instructions for every phone, network-level blocking and all UK reporting routes are in our guide: How to block and report unwanted calls in the UK.
How to stop unwanted calls for good
Blocking 01666 numbers stops that one number, but determined nuisance callers simply switch numbers. Silencing unknown callers, enabling your network's free spam shield and registering with the TPS cut the volume across the board — our canonical guide walks through each step: How to block and report unwanted calls in the UK.
Frequently asked questions about the 01666 code
Where is the 01666 area code?
The 01666 area code is allocated by Ofcom to Malmesbury in Wiltshire, United Kingdom. It is a geographic UK landline dialling code under the National Telephone Numbering Plan. The surrounding dialling area also takes in Tetbury, Lyneham, Lea and nearby villages.
Is 01666 always a Malmesbury number?
Numbers with the 01666 prefix were originally allocated by Ofcom to Malmesbury. With UK number portability and VoIP allowing geographic relocation while keeping the same number, the call origin can differ from the original area, but the prefix's official assigned location remains Malmesbury.
How do I block 01666 spam calls?
On iPhone, tap the (i) next to the number in Recents and choose Block this Caller. On Android, long-press the number in Recents and choose Block. To prevent unknown 01666 numbers ringing, enable Settings → Phone → Silence Unknown Callers (iPhone) or your dialler's spam filter (Android). Forward spam texts to 7726 free of charge.
How much does a 01666 call cost?
Calls to UK 01666 geographic numbers are charged at your provider's standard rate and are usually included in inclusive minutes on any modern landline or mobile plan.
Neighbouring dialling codes
Codes covering areas around Malmesbury — useful when a caller is nearby but outside the 01666 boundary.
Living in or moving to Malmesbury?
Our free postcode reports cover house prices, crime, broadband and schools for the districts around Malmesbury.
Check another UK number
Have the full 10- or 11-digit number? The UK Phone Number Checker shows the Ofcom range holder, risk level, and any community reports for that specific number.