UK area code
01951 area code — Colonsay
01951 is Ofcom’s Colonsay numbering area, in Argyll and Bute, Scotland. 76 phone companies hold its 87 allocated number blocks. Its numbers are written like 01951 234 567. The nearest other codes are 01681 Isle of Mull - Fionnphort (30 km) and 01546 Lochgilphead (48 km).
01951 at a glance
- Ofcom area name
- Colonsay
- Council area
- Argyll and Bute
- Country
- Scotland
- Number format
- 01951 234 567 (4+6)
- Local calls
- Full number recommended
- Current code since
- 1995 (previously 0951)
- Allocated blocks
- 87 of 487 (18%) across 76 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 01951 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.
01951 history and number format
Number format: Numbers on 01951 use Ofcom's 4+6 format: the 5-digit code (including the leading 0) followed by a 6-digit local number — written like 01951 234 567.
Before 1995: 01951 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 0951.
Local dialling: Traditionally not from another 01951 landline, but it now depends on your provider: Ofcom stopped requiring providers to offer local (code-free) dialling on 11 March 2022. Dialling 01951 first always works, and mobiles always need it.
Allocation record: the oldest number block still visible on 01951 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 01951 number rings (see the weekly numbering changelog for every new allocation.)
Phone companies holding 01951 numbers
Every Ofcom range holder with blocks on 01951, 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 |
| Digital Space Group Limited | 2 | 2 | 4 June 2008 | 15 March 2016 |
| Fuse 2 Communications Ltd | 2 | 2 | 3 July 2017 | 22 January 2024 |
| GCI Network Solutions Limited | 2 | 2 | 2 May 2017 | 20 December 2023 |
| TalkTalk Communications Limited | 2 | 2 | 19 January 2012 | 19 January 2012 |
| (AQ) LIMITED | 1 | 1 | 28 September 2012 | 28 September 2012 |
| 24 Seven Cloud Communications Ltd | 1 | 1 | 17 January 2020 | 17 January 2020 |
| 8x8 Communications UK Limited | 1 | 1 | 19 April 2012 | 19 April 2012 |
| AQL Wholesale Ltd | 1 | 1 | 3 January 2008 | 3 January 2008 |
| Adepteo Limited | 1 | 1 | 29 November 2016 | 29 November 2016 |
| Andrews & Arnold (Numbers) Ltd | 1 | 1 | 14 April 2009 | 14 April 2009 |
| Atomstream Limited | 1 | 1 | 14 April 2010 | 14 April 2010 |
| BT | 1 | 1 | 15 July 1994 | 15 July 1994 |
| Barritel Limited | 1 | 1 | 6 June 2007 | 6 June 2007 |
| Belgacom International Carrier Services SA | 1 | 1 | 16 September 2021 | 16 September 2021 |
| Bicom Systems EURL | 1 | 1 | 1 March 2012 | 1 March 2012 |
| Bink Networks Ltd | 1 | 1 | 29 March 2023 | 29 March 2023 |
| CFL Communications Ltd | 1 | 1 | 21 July 2009 | 21 July 2009 |
| Calltracks Limited | 1 | 1 | 20 September 2013 | 20 September 2013 |
| 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 | 22 June 2012 | 22 June 2012 |
| EVE CONNECT LTD | 1 | 1 | 22 June 2022 | 22 June 2022 |
| Flextel Limited | 1 | 1 | 26 October 2005 | 26 October 2005 |
| Hello Telecom (UK) Limited | 1 | 1 | 2 February 2012 | 2 February 2012 |
| ICC Networks Ltd | 1 | 1 | 18 April 2012 | 18 April 2012 |
| ICUK Computing Services Limited | 1 | 1 | 17 June 2020 | 17 June 2020 |
| INTELLIGENT EXCHANGES LIMITED | 1 | 1 | 26 January 2026 | 26 January 2026 |
Showing the 30 largest of 76 holders.
All number blocks on 01951first 200 of 487, by prefix
| Prefix | Status | Range holder |
|---|---|---|
| +44 195100 | Protected | — |
| +44 195101 | Protected | — |
| +44 195102 | Protected | — |
| +44 195103 | Protected | — |
| +44 195104 | Protected | — |
| +44 195105 | Protected | — |
| +44 195106 | Protected | — |
| +44 195107 | Protected | — |
| +44 195108 | Protected | — |
| +44 195109 | Protected | — |
| +44 195110 | Protected | — |
| +44 195111 | Protected | — |
| +44 195112 | Protected | — |
| +44 195113 | Protected | — |
| +44 195114 | Protected | — |
| +44 195115 | Protected | — |
| +44 195116 | Protected | — |
| +44 195117 | Protected | — |
| +44 195118 | Protected | — |
| +44 195119 | Protected | — |
| +44 195120 | Allocated | BT |
| +44 1951210 | Allocated | Linear Telecoms Limited |
| +44 1951211 | Allocated | Inet Telecoms Ltd (Voipfone) |
| +44 1951212 | Allocated | Internexus Networks Limited |
| +44 1951213 | Allocated | Hello Telecom (UK) Limited |
| +44 1951214 | Allocated | Bicom Systems EURL |
| +44 1951215 | Protected | — |
| +44 1951216 | Allocated | ICC Networks Ltd |
| +44 1951217 | Allocated | 8x8 Communications UK Limited |
| +44 1951218 | Allocated | Simwood eSMS Limited |
| +44 1951219 | Allocated | IOVOX Limited |
| +44 195122 | Allocated | GCI Network Solutions Limited |
| +44 195123 | Allocated | Magrathea Telecommunications Limited |
| +44 1951240 | Allocated | Gamma Telecom Holdings Limited |
| +44 1951241 | Allocated | Gamma Telecom Holdings Limited |
| +44 1951242 | Allocated | Gamma Telecom Holdings Limited |
| +44 1951243 | Allocated | Gamma Telecom Holdings Limited |
| +44 1951244 | Allocated | Gamma Telecom Holdings Limited |
| +44 1951245 | Allocated | Gamma Telecom Holdings Limited |
| +44 1951246 | Allocated | Gamma Telecom Holdings Limited |
| +44 1951247 | Allocated | Gamma Telecom Holdings Limited |
| +44 1951248 | Protected | — |
| +44 1951249 | Protected | — |
| +44 195125 | Allocated | TTNC Limited |
| +44 195126 | Allocated | Flextel Limited |
| +44 1951270 | Protected | — |
| +44 1951271 | Protected | — |
| +44 1951272 | Protected | — |
| +44 1951273 | Protected | — |
| +44 1951274 | Protected | — |
| +44 1951275 | Protected | — |
| +44 1951276 | Protected | — |
| +44 1951277 | Protected | — |
| +44 1951278 | Protected | — |
| +44 1951279 | Protected | — |
| +44 195128 | Protected | — |
| +44 195129 | Protected | — |
| +44 1951300 | Protected | — |
| +44 1951301 | Protected | — |
| +44 1951302 | Protected | — |
| +44 1951303 | Protected | — |
| +44 1951304 | Protected | — |
| +44 1951305 | Protected | — |
| +44 1951306 | Protected | — |
| +44 1951307 | Protected | — |
| +44 1951308 | Allocated | TalkTalk Communications Limited |
| +44 1951309 | Allocated | TalkTalk Communications Limited |
| +44 195131 | Protected | — |
| +44 195132 | Allocated | VoIP-Un Limited |
| +44 195133 | Allocated | Net-Work Internet Ltd |
| +44 195134 | Allocated | AQL Wholesale Ltd |
| +44 195135 | Allocated | Redcentric Solutions Limited |
| +44 195136 | Allocated | Telecom2 Limited |
| +44 195137 | Allocated | Digital Space Group Limited |
| +44 195138 | Allocated | Nodemax Limited |
| +44 1951390 | Allocated | Voxbone SA |
| +44 1951391 | Protected | — |
| +44 1951392 | Protected | — |
| +44 1951393 | Protected | — |
| +44 1951394 | Protected | — |
| +44 1951395 | Protected | — |
| +44 1951396 | Protected | — |
| +44 1951397 | Protected | — |
| +44 1951398 | Protected | — |
| +44 1951399 | Protected | — |
| +44 1951400 | Allocated | Invoco Ltd |
| +44 1951401 | Allocated | Ziron Limited |
| +44 1951402 | Allocated | Content Guru Limited |
| +44 1951403 | Allocated | Kalnet4U Ltd |
| +44 1951404 | Protected | — |
| +44 1951405 | Allocated | Minotaur Telecom Limited |
| +44 1951406 | Allocated | Nuso Cloud UK Limited |
| +44 1951407 | Allocated | Convergence Group (wireless) Networks Limited |
| +44 1951408 | Protected | — |
| +44 1951409 | Allocated | XoverX Ltd |
| +44 1951410 | Allocated | Digitech Solutions Global Limited |
| +44 1951411 | Free | — |
| +44 1951412 | Free | — |
| +44 1951413 | Free | — |
| +44 1951414 | Allocated | KCOM Group Ltd |
| +44 1951415 | Free | — |
| +44 1951416 | Free | — |
| +44 1951417 | Free | — |
| +44 1951418 | Free | — |
| +44 1951419 | Allocated | Bink Networks Ltd |
| +44 1951420 | Protected | — |
| +44 1951421 | Protected | — |
| +44 1951422 | Protected | — |
| +44 1951423 | Protected | — |
| +44 1951424 | Protected | — |
| +44 1951425 | Protected | — |
| +44 1951426 | Protected | — |
| +44 1951427 | Protected | — |
| +44 1951428 | Protected | — |
| +44 1951429 | Protected | — |
| +44 195143 | Allocated | TelNG Limited |
| +44 195144 | Allocated | Localphone Limited |
| +44 195145 | Allocated | Barritel Limited |
| +44 195146 | Allocated | Voiceflex Limited |
| +44 1951470 | Protected | — |
| +44 1951471 | Protected | — |
| +44 1951472 | Protected | — |
| +44 1951473 | Protected | — |
| +44 1951474 | Protected | — |
| +44 1951475 | Protected | — |
| +44 1951476 | Protected | — |
| +44 1951477 | Allocated | Spitfire Network Services Limited |
| +44 1951478 | Protected | — |
| +44 1951479 | Protected | — |
| +44 195148 | Allocated | (AQ) LIMITED |
| +44 195149 | Allocated | Nationwide Telephone Assistance Ltd |
| +44 195150 | Protected | — |
| +44 195151 | Protected | — |
| +44 195152 | Protected | — |
| +44 195153 | Protected | — |
| +44 195154 | Allocated | Served Up Limited |
| +44 195155 | Allocated | Solutios Limited |
| +44 195156 | Quarantined | — |
| +44 195157 | Allocated | Mars Communications Limited |
| +44 1951580 | Protected | — |
| +44 1951581 | Protected | — |
| +44 1951582 | Protected | — |
| +44 1951583 | Protected | — |
| +44 1951584 | Protected | — |
| +44 1951585 | Protected | — |
| +44 1951586 | Protected | — |
| +44 1951587 | Allocated | Digital Space Group Limited |
| +44 1951588 | Protected | — |
| +44 1951589 | Protected | — |
| +44 195159 | Allocated | Andrews & Arnold (Numbers) Ltd |
| +44 195160 | Allocated | Telecoms World Limited |
| +44 195161 | Quarantined | — |
| +44 195162 | Allocated | CFL Communications Ltd |
| +44 195163 | Protected | — |
| +44 195164 | Allocated | Nexus Telecommunications Limited |
| +44 195165 | Protected | — |
| +44 1951660 | Allocated | Atomstream Limited |
| +44 1951661 | Allocated | Calltracks Limited |
| +44 1951662 | Allocated | Telephone Box Limited |
| +44 1951663 | Protected | — |
| +44 1951664 | Allocated | Phone Co-Op Numbering Limited |
| +44 1951665 | Allocated | VoiceHost Limited |
| +44 1951666 | Allocated | Windsor Telecom Limited |
| +44 1951667 | Allocated | Suretec Systems Ltd |
| +44 1951668 | Allocated | GCI Network Solutions Limited |
| +44 1951669 | Protected | — |
| +44 1951670 | Allocated | Invosys Limited |
| +44 1951671 | Allocated | INTELLIGENT EXCHANGES LIMITED |
| +44 1951672 | Protected | — |
| +44 1951673 | Protected | — |
| +44 1951674 | Allocated | Orbtalk Limited |
| +44 1951675 | Allocated | Nexbridge Communications Limited |
| +44 1951676 | Protected | — |
| +44 1951677 | Protected | — |
| +44 1951678 | Protected | — |
| +44 1951679 | Protected | — |
| +44 1951680 | Allocated | YayYay Limited |
| +44 1951681 | Protected | — |
| +44 1951682 | Allocated | Adepteo Limited |
| +44 1951683 | Allocated | Fuse 2 Communications Ltd |
| +44 1951684 | Allocated | Colt Technology Services |
| +44 1951685 | Allocated | Number Services Ltd. |
| +44 1951686 | Allocated | Redwood Technologies Ltd |
| +44 1951687 | Protected | — |
| +44 1951688 | Allocated | Fuse 2 Communications Ltd |
| +44 1951689 | Allocated | IP Voice Networks Ltd |
| +44 1951690 | Allocated | EVE CONNECT LTD |
| +44 1951691 | Allocated | Sky UK Limited |
| +44 1951692 | Allocated | 24 Seven Cloud Communications Ltd |
| +44 1951693 | Free | — |
| +44 1951694 | Allocated | Vodafone Ltd (C&W) |
| +44 1951695 | Allocated | ICUK Computing Services Limited |
| +44 1951696 | Allocated | VOXYONDER NETWORK SERVICES UK LTD |
| +44 1951697 | Allocated | Mi Telecom Limited |
| +44 1951698 | Allocated | Belgacom International Carrier Services SA |
| +44 1951699 | Allocated | Dial 9 Communications Limited |
| +44 1951700 | Protected | — |
| +44 1951701 | Protected | — |
| +44 1951702 | Protected | — |
| +44 1951703 | Protected | — |
Related lookups
- 01681 Isle of Mull - Fionnphort30 km away
- 01546 Lochgilphead48 km away
- 01852 Kilmelford49 km away
- 01496 Port Ellen49 km away
- Gamma Telecom Holdings Limited8 allocated blocks on 01951
- Digital Space Group Limited2 allocated blocks on 01951
- Fuse 2 Communications Ltd2 allocated blocks on 01951
- 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 01951
Where is area code 01951?
01951 is Ofcom's Colonsay numbering area, in Argyll and Bute, Scotland. Its exchange town is in Argyll and Bute. From abroad, drop the 0 and dial +44 1951.
Do I need to dial 01951 for a local call?
Traditionally not from another 01951 landline, but it now depends on your provider: Ofcom stopped requiring providers to offer local (code-free) dialling on 11 March 2022. Dialling 01951 first always works, and mobiles always need it.
How are 01951 numbers written?
Numbers on 01951 use Ofcom's 4+6 format: the 5-digit code (including the leading 0) followed by a 6-digit local number — written like 01951 234 567. From abroad the leading zero is dropped: +44 1951 then the local number.
What was the 01951 area code before?
01951 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 0951. Old signage or stationery showing 0951 refers to the same Colonsay numbers.
Which phone companies hold 01951 numbers?
Ofcom lists 76 providers with allocated blocks on 01951. The largest are Gamma Telecom Holdings Limited with 8 of the 87 allocated blocks, Digital Space Group Limited with 2 of the 87 allocated blocks and Fuse 2 Communications Ltd with 2 of the 87 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 01951?
By distance between exchange towns, the nearest other codes are 01681 Isle of Mull - Fionnphort (30 km), 01546 Lochgilphead (48 km), 01852 Kilmelford (49 km) and 01496 Port Ellen (49 km).
How do I report a scam call from a 01951 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.