UK area code
01871 area code — Castlebay
01871 is Ofcom’s Castlebay numbering area, in Na h-Eileanan Siar, Scotland. 77 phone companies hold its 88 allocated number blocks. Its numbers are written like 01871 234 567. The nearest other codes are 01878 Lochboisdale (25 km) and 01870 Isle of Benbecula (58 km).
01871 at a glance
- Ofcom area name
- Castlebay
- Council area
- Na h-Eileanan Siar
- Country
- Scotland
- Number format
- 01871 234 567 (4+6)
- Local calls
- Full number recommended
- Current code since
- 1995 (previously 0871)
- Allocated blocks
- 88 of 505 (17%) 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 01871 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.
01871 history and number format
Number format: Numbers on 01871 use Ofcom's 4+6 format: the 5-digit code (including the leading 0) followed by a 6-digit local number — written like 01871 234 567.
Before 1995: 01871 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 0871.
Local dialling: Traditionally not from another 01871 landline, but it now depends on your provider: Ofcom stopped requiring providers to offer local (code-free) dialling on 11 March 2022. Dialling 01871 first always works, and mobiles always need it.
Allocation record: the oldest number block still visible on 01871 was allocated on 15 July 1994, 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 01871 number rings (see the weekly numbering changelog for every new allocation.)
Phone companies holding 01871 numbers
Every Ofcom range holder with blocks on 01871, 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 | 8 | 8 | 7 February 2013 | 7 February 2013 |
| BT | 2 | 2 | 15 July 1994 | 15 July 1994 |
| Digital Space Group Limited | 2 | 2 | 23 May 2008 | 15 March 2016 |
| Fuse 2 Communications Ltd | 2 | 2 | 3 July 2017 | 22 January 2024 |
| 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 |
| Belgacom International Carrier Services SA | 1 | 1 | 20 August 2021 | 20 August 2021 |
| Bicom Systems EURL | 1 | 1 | 2 March 2012 | 2 March 2012 |
| Bink Networks Ltd | 1 | 1 | 29 March 2023 | 29 March 2023 |
| CFL Communications Ltd | 1 | 1 | 17 July 2009 | 17 July 2009 |
| Colt Technology Services | 1 | 1 | 20 June 2016 | 20 June 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 | 22 June 2012 | 22 June 2012 |
| EVE CONNECT LTD | 1 | 1 | 22 June 2022 | 22 June 2022 |
| Flextel Limited | 1 | 1 | 24 October 2005 | 24 October 2005 |
| GCI Network Solutions Limited | 1 | 1 | 22 December 2023 | 22 December 2023 |
| Hello Telecom (UK) Limited | 1 | 1 | 20 July 2012 | 20 July 2012 |
| ICC Networks Ltd | 1 | 1 | 18 April 2012 | 18 April 2012 |
| ICUK Computing Services Limited | 1 | 1 | 23 November 2022 | 23 November 2022 |
| INTELLIGENT EXCHANGES LIMITED | 1 | 1 | 26 January 2026 | 26 January 2026 |
Showing the 30 largest of 77 holders.
All number blocks on 01871first 200 of 505, by prefix
| Prefix | Status | Range holder |
|---|---|---|
| +44 187100 | Protected | — |
| +44 187101 | Protected | — |
| +44 187102 | Protected | — |
| +44 187103 | Protected | — |
| +44 187104 | Protected | — |
| +44 187105 | Protected | — |
| +44 187106 | Protected | — |
| +44 187107 | Protected | — |
| +44 187108 | Protected | — |
| +44 187109 | Protected | — |
| +44 187110 | Protected | — |
| +44 187111 | Protected | — |
| +44 187112 | Protected | — |
| +44 187113 | Protected | — |
| +44 187114 | Protected | — |
| +44 187115 | Protected | — |
| +44 187116 | Protected | — |
| +44 187117 | Protected | — |
| +44 187118 | Protected | — |
| +44 187119 | Protected | — |
| +44 1871200 | Allocated | Gamma Telecom Holdings Limited |
| +44 1871201 | Protected | — |
| +44 1871202 | Protected | — |
| +44 1871203 | Allocated | Gamma Telecom Holdings Limited |
| +44 1871204 | Allocated | Gamma Telecom Holdings Limited |
| +44 1871205 | Allocated | Gamma Telecom Holdings Limited |
| +44 1871206 | Allocated | Gamma Telecom Holdings Limited |
| +44 1871207 | Allocated | Gamma Telecom Holdings Limited |
| +44 1871208 | Allocated | Gamma Telecom Holdings Limited |
| +44 1871209 | Allocated | Gamma Telecom Holdings Limited |
| +44 187121 | Allocated | IV Response Limited |
| +44 187122 | Allocated | Flextel Limited |
| +44 1871230 | Protected | — |
| +44 1871231 | Protected | — |
| +44 1871232 | Protected | — |
| +44 1871233 | Protected | — |
| +44 1871234 | Protected | — |
| +44 1871235 | Protected | — |
| +44 1871236 | Protected | — |
| +44 1871237 | Protected | — |
| +44 1871238 | Protected | — |
| +44 1871239 | Protected | — |
| +44 1871240 | Allocated | Convergence Group (wireless) Networks Limited |
| +44 1871241 | Allocated | Inet Telecoms Ltd (Voipfone) |
| +44 1871242 | Allocated | Invoco Ltd |
| +44 1871243 | Allocated | Hello Telecom (UK) Limited |
| +44 1871244 | Allocated | Ziron Limited |
| +44 1871245 | Protected | — |
| +44 1871246 | Allocated | IOVOX Limited |
| +44 1871247 | Allocated | Content Guru Limited |
| +44 1871248 | Allocated | Minotaur Telecom Limited |
| +44 1871249 | Protected | — |
| +44 187125 | Allocated | AQL Wholesale Ltd |
| +44 187126 | Allocated | Redcentric Solutions Limited |
| +44 187127 | Allocated | Telecom2 Limited |
| +44 187128 | Allocated | Digital Space Group Limited |
| +44 187129 | Allocated | Nodemax Limited |
| +44 187130 | Allocated | Net-Work Internet Ltd |
| +44 1871310 | Allocated | Voxbone SA |
| +44 1871311 | Protected | — |
| +44 1871312 | Protected | — |
| +44 1871313 | Protected | — |
| +44 1871314 | Protected | — |
| +44 1871315 | Protected | — |
| +44 1871316 | Protected | — |
| +44 1871317 | Protected | — |
| +44 1871318 | Protected | — |
| +44 1871319 | Protected | — |
| +44 187132 | Protected | — |
| +44 187133 | Allocated | Served Up Limited |
| +44 187134 | Protected | — |
| +44 187135 | Allocated | Solutios Limited |
| +44 187136 | Allocated | Andrews & Arnold (Numbers) Ltd |
| +44 1871370 | Protected | — |
| +44 1871371 | Protected | — |
| +44 1871372 | Protected | — |
| +44 1871373 | Protected | — |
| +44 1871374 | Protected | — |
| +44 1871375 | Protected | — |
| +44 1871376 | Protected | — |
| +44 1871377 | Allocated | Digital Space Group Limited |
| +44 1871378 | Protected | — |
| +44 1871379 | Protected | — |
| +44 187138 | Allocated | Mars Communications Limited |
| +44 187139 | Quarantined | — |
| +44 187140 | Quarantined | — |
| +44 187141 | Allocated | CFL Communications Ltd |
| +44 187142 | Allocated | Nexus Telecommunications Limited |
| +44 1871430 | Allocated | Atomstream Limited |
| +44 1871431 | Protected | — |
| +44 1871432 | Allocated | Windsor Telecom Limited |
| +44 1871433 | Allocated | Telappliant Limited |
| +44 1871434 | Allocated | Suretec Systems Ltd |
| +44 1871435 | Allocated | Telephone Box Limited |
| +44 1871436 | Allocated | GCI Network Solutions Limited |
| +44 1871437 | Allocated | Simwood eSMS Limited |
| +44 1871438 | Protected | — |
| +44 1871439 | Allocated | Phone Co-Op Numbering Limited |
| +44 187144 | Protected | — |
| +44 1871450 | Protected | — |
| +44 1871451 | Allocated | Nexbridge Communications Limited |
| +44 1871452 | Allocated | Adepteo Limited |
| +44 1871453 | Protected | — |
| +44 1871454 | Allocated | INTELLIGENT EXCHANGES LIMITED |
| +44 1871455 | Allocated | Internexus Networks Limited |
| +44 1871456 | Allocated | Bicom Systems EURL |
| +44 1871457 | Allocated | ICC Networks Ltd |
| +44 1871458 | Protected | — |
| +44 1871459 | Allocated | 8x8 Communications UK Limited |
| +44 1871460 | Allocated | YayYay Limited |
| +44 1871461 | Allocated | Colt Technology Services |
| +44 1871462 | Allocated | Kalnet4U Ltd |
| +44 1871463 | Allocated | Orbtalk Limited |
| +44 1871464 | Allocated | Fuse 2 Communications Ltd |
| +44 1871465 | Allocated | Redwood Technologies Ltd |
| +44 1871466 | Allocated | Nuso Cloud UK Limited |
| +44 1871467 | Protected | — |
| +44 1871468 | Protected | — |
| +44 1871469 | Allocated | XoverX Ltd |
| +44 1871470 | Allocated | Zapappi Ltd |
| +44 1871471 | Allocated | Fuse 2 Communications Ltd |
| +44 1871472 | Allocated | Sky UK Limited |
| +44 1871473 | Allocated | Vodafone Ltd (C&W) |
| +44 1871474 | Allocated | IP Voice Networks Ltd |
| +44 1871475 | Allocated | EVE CONNECT LTD |
| +44 1871476 | Allocated | Dial 9 Communications Limited |
| +44 1871477 | Allocated | Number Services Ltd. |
| +44 1871478 | Allocated | Alnitak GmbH |
| +44 1871479 | Allocated | 24 Seven Cloud Communications Ltd |
| +44 1871480 | Allocated | KCOM Group Ltd |
| +44 1871481 | Free | — |
| +44 1871482 | Free | — |
| +44 1871483 | Free | — |
| +44 1871484 | Allocated | Mi Telecom Limited |
| +44 1871485 | Allocated | VOXYONDER NETWORK SERVICES UK LTD |
| +44 1871486 | Allocated | ICUK Computing Services Limited |
| +44 1871487 | Allocated | Bink Networks Ltd |
| +44 1871488 | Allocated | Belgacom International Carrier Services SA |
| +44 1871489 | Free | — |
| +44 1871490 | Free | — |
| +44 1871491 | Free | — |
| +44 1871492 | Free | — |
| +44 1871493 | Protected | — |
| +44 1871494 | Protected | — |
| +44 1871495 | Protected | — |
| +44 1871496 | Protected | — |
| +44 1871497 | Protected | — |
| +44 1871498 | Protected | — |
| +44 1871499 | Protected | — |
| +44 1871500 | Protected | — |
| +44 1871501 | Protected | — |
| +44 1871502 | Protected | — |
| +44 1871503 | Protected | — |
| +44 1871504 | Protected | — |
| +44 1871505 | Protected | — |
| +44 1871506 | Protected | — |
| +44 1871507 | Protected | — |
| +44 1871508 | Protected | — |
| +44 1871509 | Protected | — |
| +44 1871510 | Protected | — |
| +44 1871511 | Protected | — |
| +44 1871512 | Protected | — |
| +44 1871513 | Protected | — |
| +44 1871514 | Protected | — |
| +44 1871515 | Protected | — |
| +44 1871516 | Protected | — |
| +44 1871517 | Protected | — |
| +44 1871518 | Protected | — |
| +44 1871519 | Protected | — |
| +44 1871520 | Protected | — |
| +44 1871521 | Protected | — |
| +44 1871522 | Protected | — |
| +44 1871523 | Protected | — |
| +44 1871524 | Protected | — |
| +44 1871525 | Protected | — |
| +44 1871526 | Protected | — |
| +44 1871527 | Protected | — |
| +44 1871528 | Protected | — |
| +44 1871529 | Protected | — |
| +44 1871530 | Protected | — |
| +44 1871531 | Protected | — |
| +44 1871532 | Protected | — |
| +44 1871533 | Protected | — |
| +44 1871534 | Protected | — |
| +44 1871535 | Protected | — |
| +44 1871536 | Protected | — |
| +44 1871537 | Protected | — |
| +44 1871538 | Protected | — |
| +44 1871539 | Protected | — |
| +44 1871540 | Protected | — |
| +44 1871541 | Protected | — |
| +44 1871542 | Protected | — |
| +44 1871543 | Protected | — |
| +44 1871544 | Protected | — |
| +44 1871545 | Protected | — |
| +44 1871546 | Protected | — |
| +44 1871547 | Protected | — |
| +44 1871548 | Protected | — |
| +44 1871549 | Protected | — |
| +44 1871550 | Protected | — |
Related lookups
- 01878 Lochboisdale25 km away
- 01870 Isle of Benbecula58 km away
- 01879 Scarinish65 km away
- 01876 Lochmaddy75 km away
- Gamma Telecom Holdings Limited8 allocated blocks on 01871
- BT2 allocated blocks on 01871
- Digital Space Group Limited2 allocated blocks on 01871
- All UK towns A–ZDialling codes by town
- More Outer Hebrides 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 01871
Where is area code 01871?
01871 is Ofcom's Castlebay numbering area, in Na h-Eileanan Siar, Scotland. Its exchange town is in Na h-Eileanan Siar. From abroad, drop the 0 and dial +44 1871.
Do I need to dial 01871 for a local call?
Traditionally not from another 01871 landline, but it now depends on your provider: Ofcom stopped requiring providers to offer local (code-free) dialling on 11 March 2022. Dialling 01871 first always works, and mobiles always need it.
How are 01871 numbers written?
Numbers on 01871 use Ofcom's 4+6 format: the 5-digit code (including the leading 0) followed by a 6-digit local number — written like 01871 234 567. From abroad the leading zero is dropped: +44 1871 then the local number.
What was the 01871 area code before?
01871 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 0871. Old signage or stationery showing 0871 refers to the same Castlebay numbers.
Which phone companies hold 01871 numbers?
Ofcom lists 77 providers with allocated blocks on 01871. The largest are Gamma Telecom Holdings Limited with 8 of the 88 allocated blocks, BT with 2 of the 88 allocated blocks and Digital Space Group Limited with 2 of the 88 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 01871?
By distance between exchange towns, the nearest other codes are 01878 Lochboisdale (25 km), 01870 Isle of Benbecula (58 km), 01879 Scarinish (65 km) and 01876 Lochmaddy (75 km).
How do I report a scam call from a 01871 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.