UK area code
01866 area code — Kilchrenan
01866 is Ofcom’s Kilchrenan numbering area, in Argyll and Bute, Scotland. 77 phone companies hold its 91 allocated number blocks. Its numbers are written like 01866 234 567. The nearest other codes are 01838 Dalmally (14 km) and 01499 Inveraray (15 km).
01866 at a glance
- Ofcom area name
- Kilchrenan
- Council area
- Argyll and Bute
- Country
- Scotland
- Number format
- 01866 234 567 (4+6)
- Local calls
- Full number recommended
- Current code since
- 1995 (previously 0866)
- Allocated blocks
- 91 of 487 (19%) across 77 providers
- Newest block
- 26 January 2026 (1 in the last 12 months)
Sources: Ofcom numbering data (weekly) and area-code list, Ofcom Numbering Plan, ONS geography.
If a 01866 number called you
No clear pattern in reports for these numbers yet. If a call worried you:
- 1
Call back on a number you trust
If a caller says they're your bank, HMRC, a courier or a council, 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
Forward it to 7726
On a mobile, copy the caller's number from your recent calls and text it to 7726 (it spells SPAM). Scam texts can be forwarded to 7726 as they are. It's free, and your network uses the reports to investigate and block numbers.
- 3
Stop sales calls
Register your landline and mobile free with the Telephone Preference Service (0345 070 0707). Legitimate UK marketers must check it; calls should drop within 28 days. It won't stop scammers.
- 4
If you lost money or shared details
Call your bank on the number on your card (or 159 to reach most UK banks safely), then report it to Police Scotland on 101. In Scotland fraud goes to Police Scotland rather than Report Fraud.
01866 history and number format
Number format: Numbers on 01866 use Ofcom's 4+6 format: the 5-digit code (including the leading 0) followed by a 6-digit local number — written like 01866 234 567.
Before 1995: 01866 took its current form at PhONEday on 16 April 1995, when a "1" was inserted into every UK geographic code — before that the area dialled 0866.
Local dialling: Traditionally not from another 01866 landline, but it now depends on your provider: Ofcom stopped requiring providers to offer local (code-free) dialling on 11 March 2022. Dialling 01866 first always works, and mobiles always need it.
Allocation record: the oldest number block still visible on 01866 was allocated on 8 June 2005, and the most recent on 26 January 2026. 1 block was allocated in the last 12 months — newly-activated ranges with no call history, which is worth knowing when an unfamiliar 01866 number rings (see the weekly numbering changelog for every new allocation.)
Phone companies holding 01866 numbers
Every Ofcom range holder with blocks on 01866, by allocated blocks. The holder is the company Ofcom allocated the block to; a number can since have been ported to another provider (see range holder vs current provider).
| Range holder | Allocated | All blocks | First block | Latest block |
|---|---|---|---|---|
| Gamma Telecom Holdings Limited | 9 | 9 | 14 April 2010 | 7 February 2013 |
| BT | 3 | 3 | 15 July 2005 | 15 July 2005 |
| Digital Space Group Limited | 2 | 2 | 23 May 2008 | 15 March 2016 |
| Fuse 2 Communications Ltd | 2 | 2 | 3 July 2017 | 22 January 2024 |
| Mi Telecom Limited | 2 | 2 | 3 July 2020 | 3 July 2020 |
| TalkTalk Communications Limited | 2 | 2 | 20 January 2012 | 20 January 2012 |
| (AQ) LIMITED | 1 | 1 | 24 April 2013 | 24 April 2013 |
| 24 Seven Cloud Communications Ltd | 1 | 1 | 17 January 2020 | 17 January 2020 |
| 8x8 Communications UK Limited | 1 | 1 | 18 April 2012 | 18 April 2012 |
| AQL Wholesale Ltd | 1 | 1 | 3 January 2008 | 3 January 2008 |
| Adepteo Limited | 1 | 1 | 29 November 2016 | 29 November 2016 |
| Alnitak GmbH | 1 | 1 | 20 September 2017 | 20 September 2017 |
| Andrews & Arnold (Numbers) Ltd | 1 | 1 | 2 April 2009 | 2 April 2009 |
| Atomstream Limited | 1 | 1 | 12 April 2010 | 12 April 2010 |
| Barritel Limited | 1 | 1 | 12 June 2007 | 12 June 2007 |
| Bicom Systems EURL | 1 | 1 | 2 March 2012 | 2 March 2012 |
| Bink Networks Ltd | 1 | 1 | 3 April 2023 | 3 April 2023 |
| CFL Communications Ltd | 1 | 1 | 17 July 2009 | 17 July 2009 |
| Colt Technology Services | 1 | 1 | 7 July 2016 | 7 July 2016 |
| Content Guru Limited | 1 | 1 | 11 October 2012 | 11 October 2012 |
| Convergence Group (wireless) Networks Limited | 1 | 1 | 21 May 2019 | 21 May 2019 |
| Dial 9 Communications Limited | 1 | 1 | 8 January 2020 | 8 January 2020 |
| Digitech Solutions Global Limited | 1 | 1 | 26 June 2012 | 26 June 2012 |
| EVE CONNECT LTD | 1 | 1 | 22 June 2022 | 22 June 2022 |
| Entanet International Ltd | 1 | 1 | 20 December 2007 | 20 December 2007 |
| Flextel Limited | 1 | 1 | 17 November 2005 | 17 November 2005 |
| GCI Network Solutions Limited | 1 | 1 | 20 December 2023 | 20 December 2023 |
| Hello Telecom (UK) Limited | 1 | 1 | 24 November 2011 | 24 November 2011 |
| I.T Communications Limited | 1 | 1 | 10 June 2016 | 10 June 2016 |
| ICC Networks Ltd | 1 | 1 | 18 April 2012 | 18 April 2012 |
Showing the 30 largest of 77 holders.
All number blocks on 01866first 200 of 487, by prefix
| Prefix | Status | Range holder |
|---|---|---|
| +44 186600 | Protected | — |
| +44 186601 | Protected | — |
| +44 186602 | Protected | — |
| +44 186603 | Protected | — |
| +44 186604 | Protected | — |
| +44 186605 | Protected | — |
| +44 186606 | Protected | — |
| +44 186607 | Protected | — |
| +44 186608 | Protected | — |
| +44 186609 | Protected | — |
| +44 186610 | Protected | — |
| +44 186611 | Protected | — |
| +44 186612 | Protected | — |
| +44 186613 | Protected | — |
| +44 186614 | Protected | — |
| +44 186615 | Protected | — |
| +44 186616 | Protected | — |
| +44 186617 | Protected | — |
| +44 186618 | Protected | — |
| +44 186619 | Protected | — |
| +44 186620 | Allocated | Redcentric Solutions Limited |
| +44 186621 | Allocated | Telecom2 Limited |
| +44 186622 | Allocated | Net-Work Internet Ltd |
| +44 186623 | Allocated | Digital Space Group Limited |
| +44 186624 | Allocated | Nodemax Limited |
| +44 1866250 | Allocated | Voxbone SA |
| +44 1866251 | Protected | — |
| +44 1866252 | Protected | — |
| +44 1866253 | Protected | — |
| +44 1866254 | Protected | — |
| +44 1866255 | Protected | — |
| +44 1866256 | Protected | — |
| +44 1866257 | Protected | — |
| +44 1866258 | Protected | — |
| +44 1866259 | Protected | — |
| +44 186626 | Protected | — |
| +44 186627 | Allocated | Served Up Limited |
| +44 186628 | Allocated | Solutios Limited |
| +44 186629 | Quarantined | — |
| +44 186630 | Allocated | Mars Communications Limited |
| +44 186631 | Allocated | Andrews & Arnold (Numbers) Ltd |
| +44 186632 | Protected | — |
| +44 186633 | Quarantined | — |
| +44 186634 | Allocated | CFL Communications Ltd |
| +44 186635 | Protected | — |
| +44 186636 | Allocated | Nexus Telecommunications Limited |
| +44 1866370 | Allocated | Atomstream Limited |
| +44 1866371 | Allocated | Convergence Group (wireless) Networks Limited |
| +44 1866372 | Allocated | VoiceHost Limited |
| +44 1866373 | Allocated | Suretec Systems Ltd |
| +44 1866374 | Allocated | Telephone Box Limited |
| +44 1866375 | Protected | — |
| +44 1866376 | Allocated | Windsor Telecom Limited |
| +44 1866377 | Allocated | Gamma Telecom Holdings Limited |
| +44 1866378 | Allocated | GCI Network Solutions Limited |
| +44 1866379 | Allocated | Phone Co-Op Numbering Limited |
| +44 1866380 | Protected | — |
| +44 1866381 | Allocated | Nexbridge Communications Limited |
| +44 1866382 | Allocated | YayYay Limited |
| +44 1866383 | Allocated | INTELLIGENT EXCHANGES LIMITED |
| +44 1866384 | Protected | — |
| +44 1866385 | Allocated | Ziron Limited |
| +44 1866386 | Allocated | Content Guru Limited |
| +44 1866387 | Allocated | IOVOX Limited |
| +44 1866388 | Allocated | Invoco Ltd |
| +44 1866389 | Protected | — |
| +44 1866390 | Protected | — |
| +44 1866391 | Allocated | Nuso Cloud UK Limited |
| +44 1866392 | Allocated | Kalnet4U Ltd |
| +44 1866393 | Allocated | Fuse 2 Communications Ltd |
| +44 1866394 | Allocated | Alnitak GmbH |
| +44 1866395 | Protected | — |
| +44 1866396 | Allocated | Redwood Technologies Ltd |
| +44 1866397 | Allocated | Orbtalk Limited |
| +44 1866398 | Allocated | Fuse 2 Communications Ltd |
| +44 1866399 | Allocated | XoverX Ltd |
| +44 1866400 | Protected | — |
| +44 1866401 | Allocated | I.T Communications Limited |
| +44 1866402 | Allocated | Adepteo Limited |
| +44 1866403 | Allocated | EVE CONNECT LTD |
| +44 1866404 | Allocated | Colt Technology Services |
| +44 1866405 | Allocated | IP Voice Networks Ltd |
| +44 1866406 | Allocated | Number Services Ltd. |
| +44 1866407 | Allocated | Sky UK Limited |
| +44 1866408 | Allocated | Zapappi Ltd |
| +44 1866409 | Allocated | Invosys Limited |
| +44 1866410 | Free | — |
| +44 1866411 | Free | — |
| +44 1866412 | Free | — |
| +44 1866413 | Free | — |
| +44 1866414 | Free | — |
| +44 1866415 | Free | — |
| +44 1866416 | Free | — |
| +44 1866417 | Free | — |
| +44 1866418 | Free | — |
| +44 1866419 | Free | — |
| +44 1866420 | Protected | — |
| +44 1866421 | Protected | — |
| +44 1866422 | Protected | — |
| +44 1866423 | Protected | — |
| +44 1866424 | Protected | — |
| +44 1866425 | Protected | — |
| +44 1866426 | Protected | — |
| +44 1866427 | Protected | — |
| +44 1866428 | Protected | — |
| +44 1866429 | Protected | — |
| +44 1866430 | Protected | — |
| +44 1866431 | Protected | — |
| +44 1866432 | Protected | — |
| +44 1866433 | Protected | — |
| +44 1866434 | Protected | — |
| +44 1866435 | Protected | — |
| +44 1866436 | Protected | — |
| +44 1866437 | Protected | — |
| +44 1866438 | Protected | — |
| +44 1866439 | Protected | — |
| +44 1866440 | Protected | — |
| +44 1866441 | Protected | — |
| +44 1866442 | Protected | — |
| +44 1866443 | Protected | — |
| +44 1866444 | Protected | — |
| +44 1866445 | Protected | — |
| +44 1866446 | Protected | — |
| +44 1866447 | Protected | — |
| +44 1866448 | Protected | — |
| +44 1866449 | Protected | — |
| +44 1866450 | Protected | — |
| +44 1866451 | Protected | — |
| +44 1866452 | Protected | — |
| +44 1866453 | Protected | — |
| +44 1866454 | Protected | — |
| +44 1866455 | Protected | — |
| +44 1866456 | Protected | — |
| +44 1866457 | Protected | — |
| +44 1866458 | Protected | — |
| +44 1866459 | Protected | — |
| +44 1866460 | Protected | — |
| +44 1866461 | Protected | — |
| +44 1866462 | Protected | — |
| +44 1866463 | Protected | — |
| +44 1866464 | Protected | — |
| +44 1866465 | Protected | — |
| +44 1866466 | Protected | — |
| +44 1866467 | Protected | — |
| +44 1866468 | Protected | — |
| +44 1866469 | Protected | — |
| +44 1866470 | Protected | — |
| +44 1866471 | Protected | — |
| +44 1866472 | Protected | — |
| +44 1866473 | Protected | — |
| +44 1866474 | Protected | — |
| +44 1866475 | Protected | — |
| +44 1866476 | Protected | — |
| +44 1866477 | Protected | — |
| +44 1866478 | Protected | — |
| +44 1866479 | Protected | — |
| +44 1866480 | Protected | — |
| +44 1866481 | Protected | — |
| +44 1866482 | Protected | — |
| +44 1866483 | Protected | — |
| +44 1866484 | Protected | — |
| +44 1866485 | Protected | — |
| +44 1866486 | Protected | — |
| +44 1866487 | Protected | — |
| +44 1866488 | Protected | — |
| +44 1866489 | Protected | — |
| +44 1866490 | Protected | — |
| +44 1866491 | Protected | — |
| +44 1866492 | Protected | — |
| +44 1866493 | Protected | — |
| +44 1866494 | Protected | — |
| +44 1866495 | Protected | — |
| +44 1866496 | Protected | — |
| +44 1866497 | Protected | — |
| +44 1866498 | Protected | — |
| +44 1866499 | Protected | — |
| +44 1866500 | Protected | — |
| +44 1866501 | Protected | — |
| +44 1866502 | Protected | — |
| +44 1866503 | Protected | — |
| +44 1866504 | Protected | — |
| +44 1866505 | Protected | — |
| +44 1866506 | Protected | — |
| +44 1866507 | Protected | — |
| +44 1866508 | Protected | — |
| +44 1866509 | Protected | — |
| +44 1866510 | Protected | — |
| +44 1866511 | Protected | — |
| +44 1866512 | Protected | — |
| +44 1866513 | Protected | — |
| +44 1866514 | Protected | — |
| +44 1866515 | Protected | — |
| +44 1866516 | Protected | — |
| +44 1866517 | Protected | — |
| +44 1866518 | Protected | — |
| +44 1866519 | Protected | — |
| +44 1866520 | Protected | — |
| +44 1866521 | Protected | — |
| +44 1866522 | Protected | — |
| +44 1866523 | Protected | — |
Related lookups
- 01838 Dalmally14 km away
- 01499 Inveraray15 km away
- 01631 Oban19 km away
- 01852 Kilmelford22 km away
- Gamma Telecom Holdings Limited9 allocated blocks on 01866
- BT3 allocated blocks on 01866
- Digital Space Group Limited2 allocated blocks on 01866
- All UK towns A–ZDialling codes by town
- More Scotland codesSame region
- All UK area codesBrowse every 01/02 dialling code
- Lookup any UK numberFree reverse phone lookup
- UK area codes explainedCornerstone guide
- 020 London numbers explainedCornerstone guide
- 0330 numbers explainedCornerstone guide
- How Ofcom allocates UK phone numbersCornerstone guide
FAQs about 01866
Where is area code 01866?
01866 is Ofcom's Kilchrenan numbering area, in Argyll and Bute, Scotland. Its exchange town is in Argyll and Bute. From abroad, drop the 0 and dial +44 1866.
Do I need to dial 01866 for a local call?
Traditionally not from another 01866 landline, but it now depends on your provider: Ofcom stopped requiring providers to offer local (code-free) dialling on 11 March 2022. Dialling 01866 first always works, and mobiles always need it.
How are 01866 numbers written?
Numbers on 01866 use Ofcom's 4+6 format: the 5-digit code (including the leading 0) followed by a 6-digit local number — written like 01866 234 567. From abroad the leading zero is dropped: +44 1866 then the local number.
What was the 01866 area code before?
01866 took its current form at PhONEday on 16 April 1995, when a "1" was inserted into every UK geographic code — before that the area dialled 0866. Old signage or stationery showing 0866 refers to the same Kilchrenan numbers.
Which phone companies hold 01866 numbers?
Ofcom lists 77 providers with allocated blocks on 01866. The largest are Gamma Telecom Holdings Limited with 9 of the 91 allocated blocks, BT with 3 of the 91 allocated blocks and Digital Space Group Limited with 2 of the 91 allocated blocks. Numbers can be ported, so a number's current provider may differ from the block's holder.
Which area codes are next to 01866?
By distance between exchange towns, the nearest other codes are 01838 Dalmally (14 km), 01499 Inveraray (15 km), 01631 Oban (19 km) and 01852 Kilmelford (22 km).
How do I report a scam call from a 01866 number?
On a mobile, text the caller's number to 7726 (free). If you lost money or shared details, call your bank and report it to Police Scotland on 101. Unwanted sales calls go to the ICO after registering with the Telephone Preference Service.