UK area code
01740 area code — Sedgefield
01740 is Ofcom’s Sedgefield numbering area, in Durham, North East England. 88 phone companies hold its 128 allocated number blocks. Its numbers are written like 01740 234 567. The nearest other codes are 01325 Darlington (17 km) and 01429 Hartlepool (24 km).
01740 at a glance
- Ofcom area name
- Sedgefield
- County
- Durham
- Council area
- County Durham
- Region
- North East England
- Number format
- 01740 234 567 (4+6)
- Local calls
- Full number recommended
- Current code since
- 1995 (previously 0740)
- Allocated blocks
- 128 of 451 (28%) across 88 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 01740 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 Report Fraud online or on 0300 123 2040. Report Fraud replaced Action Fraud on 4 December 2025 for England, Wales and Northern Ireland; in Scotland call Police Scotland on 101.
01740 history and number format
Number format: Numbers on 01740 use Ofcom's 4+6 format: the 5-digit code (including the leading 0) followed by a 6-digit local number — written like 01740 234 567.
Before 1995: 01740 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 0740.
Local dialling: Traditionally not from another 01740 landline, but it now depends on your provider: Ofcom stopped requiring providers to offer local (code-free) dialling on 11 March 2022. Dialling 01740 first always works, and mobiles always need it.
Allocation record: the oldest number block still visible on 01740 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 01740 number rings (see the weekly numbering changelog for every new allocation.)
Phone companies holding 01740 numbers
Every Ofcom range holder with blocks on 01740, 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 |
|---|---|---|---|---|
| Virgin Media Limited | 12 | 12 | 29 June 2012 | 29 June 2012 |
| GCI Network Solutions Limited | 11 | 11 | 26 April 2017 | 26 February 2024 |
| BT | 7 | 7 | 15 July 1994 | 21 June 2023 |
| Gamma Telecom Holdings Limited | 5 | 5 | 8 February 2013 | 8 February 2013 |
| Sky UK Limited | 3 | 3 | 24 June 2013 | 1 November 2021 |
| TalkTalk Communications Limited | 3 | 3 | 20 January 2012 | 12 February 2013 |
| Vodafone Ltd (C&W) | 3 | 3 | 10 September 2013 | 15 November 2021 |
| DRD Communications Limited | 2 | 2 | 5 October 2023 | 5 October 2023 |
| Digital Space Group Limited | 2 | 2 | 20 May 2008 | 15 March 2016 |
| Fuse 2 Communications Ltd | 2 | 2 | 3 July 2017 | 22 January 2024 |
| (AQ) LIMITED | 1 | 1 | 26 September 2012 | 26 September 2012 |
| 24 Seven Cloud Communications Ltd | 1 | 1 | 21 January 2020 | 21 January 2020 |
| 8x8 Communications UK Limited | 1 | 1 | 10 April 2012 | 10 April 2012 |
| AQL Wholesale Ltd | 1 | 1 | 4 August 2006 | 4 August 2006 |
| Adepteo Limited | 1 | 1 | 6 December 2016 | 6 December 2016 |
| Andrews & Arnold (Numbers) Ltd | 1 | 1 | 27 March 2009 | 27 March 2009 |
| Atomstream Limited | 1 | 1 | 14 May 2010 | 14 May 2010 |
| Barritel Limited | 1 | 1 | 23 June 2006 | 23 June 2006 |
| Belgacom International Carrier Services SA | 1 | 1 | 24 April 2020 | 24 April 2020 |
| Bicom Systems EURL | 1 | 1 | 1 March 2012 | 1 March 2012 |
| Bink Networks Ltd | 1 | 1 | 11 April 2023 | 11 April 2023 |
| CFL Communications Ltd | 1 | 1 | 14 July 2009 | 14 July 2009 |
| Calltracks Limited | 1 | 1 | 22 January 2014 | 22 January 2014 |
| Colt Technology Services | 1 | 1 | 20 June 2016 | 20 June 2016 |
| Content Guru Limited | 1 | 1 | 12 October 2012 | 12 October 2012 |
| Convergence Group (wireless) Networks Limited | 1 | 1 | 21 May 2019 | 21 May 2019 |
| DIDWW Ireland Limited | 1 | 1 | 27 January 2020 | 27 January 2020 |
| Datazero Ltd | 1 | 1 | 15 November 2010 | 15 November 2010 |
| Dial 9 Communications Limited | 1 | 1 | 8 January 2020 | 8 January 2020 |
| Digitech Solutions Global Limited | 1 | 1 | 26 June 2012 | 26 June 2012 |
Showing the 30 largest of 88 holders.
All number blocks on 01740first 200 of 451, by prefix
| Prefix | Status | Range holder |
|---|---|---|
| +44 174000 | Protected | — |
| +44 174001 | Protected | — |
| +44 174002 | Protected | — |
| +44 174003 | Protected | — |
| +44 174004 | Protected | — |
| +44 174005 | Protected | — |
| +44 174006 | Protected | — |
| +44 174007 | Protected | — |
| +44 174008 | Protected | — |
| +44 174009 | Protected | — |
| +44 174010 | Protected | — |
| +44 174011 | Protected | — |
| +44 174012 | Protected | — |
| +44 174013 | Protected | — |
| +44 174014 | Protected | — |
| +44 174015 | Protected | — |
| +44 174016 | Protected | — |
| +44 174017 | Protected | — |
| +44 174018 | Protected | — |
| +44 174019 | Protected | — |
| +44 174020 | Allocated | TelNG Limited |
| +44 174021 | Allocated | Voiceflex Limited |
| +44 174022 | Allocated | Localphone Limited |
| +44 1740230 | Protected | — |
| +44 1740231 | Protected | — |
| +44 1740232 | Protected | — |
| +44 1740233 | Protected | — |
| +44 1740234 | Protected | — |
| +44 1740235 | Protected | — |
| +44 1740236 | Protected | — |
| +44 1740237 | Protected | — |
| +44 1740238 | Allocated | TalkTalk Communications Limited |
| +44 1740239 | Allocated | TalkTalk Communications Limited |
| +44 174024 | Protected | — |
| +44 174025 | Allocated | (AQ) LIMITED |
| +44 174026 | Allocated | VoIP-Un Limited |
| +44 1740270 | Allocated | YayYay Limited |
| +44 1740271 | Allocated | Convergence Group (wireless) Networks Limited |
| +44 1740272 | Protected | — |
| +44 1740273 | Allocated | Adepteo Limited |
| +44 1740274 | Protected | — |
| +44 1740275 | Protected | — |
| +44 1740276 | Allocated | Colt Technology Services |
| +44 1740277 | Allocated | Digital Space Group Limited |
| +44 1740278 | Allocated | 24 Seven Cloud Communications Ltd |
| +44 1740279 | Allocated | EVE CONNECT LTD |
| +44 174028 | Allocated | Redcentric Solutions Limited |
| +44 174029 | Allocated | Telecom2 Limited |
| +44 174030 | Allocated | Digital Space Group Limited |
| +44 174031 | Allocated | Nodemax Limited |
| +44 1740320 | Allocated | Voxbone SA |
| +44 1740321 | Protected | — |
| +44 1740322 | Protected | — |
| +44 1740323 | Protected | — |
| +44 1740324 | Protected | — |
| +44 1740325 | Protected | — |
| +44 1740326 | Protected | — |
| +44 1740327 | Protected | — |
| +44 1740328 | Protected | — |
| +44 1740329 | Protected | — |
| +44 174033 | Allocated | Net-Work Internet Ltd |
| +44 174034 | Protected | — |
| +44 174035 | Protected | — |
| +44 174036 | Allocated | Served Up Limited |
| +44 174037 | Allocated | Solutios Limited |
| +44 174038 | Quarantined | — |
| +44 174039 | Allocated | Mars Communications Limited |
| +44 174040 | Allocated | Andrews & Arnold (Numbers) Ltd |
| +44 174041 | Allocated | Telecoms World Limited |
| +44 174042 | Allocated | Invade International Ltd |
| +44 174043 | Allocated | Nexus Telecommunications Limited |
| +44 174044 | Quarantined | — |
| +44 174045 | Allocated | CFL Communications Ltd |
| +44 1740460 | Allocated | Calltracks Limited |
| +44 1740461 | Allocated | Telephone Box Limited |
| +44 1740462 | Protected | — |
| +44 1740463 | Allocated | Phone Co-Op Numbering Limited |
| +44 1740464 | Allocated | Suretec Systems Ltd |
| +44 1740465 | Allocated | Nexbridge Communications Limited |
| +44 1740466 | Allocated | Atomstream Limited |
| +44 1740467 | Allocated | INTELLIGENT EXCHANGES LIMITED |
| +44 1740468 | Protected | — |
| +44 1740469 | Allocated | Sky UK Limited |
| +44 1740470 | Allocated | Windsor Telecom Limited |
| +44 1740471 | Allocated | Datazero Ltd |
| +44 1740472 | Allocated | Vodafone Ltd (C&W) |
| +44 1740473 | Allocated | TalkTalk Communications Limited |
| +44 1740474 | Allocated | Invosys Limited |
| +44 1740475 | Allocated | Mintaka Limited |
| +44 1740476 | Protected | — |
| +44 1740477 | Allocated | Telappliant Limited |
| +44 1740478 | Allocated | Orbtalk Limited |
| +44 1740479 | Allocated | Inet Telecoms Ltd (Voipfone) |
| +44 1740480 | Allocated | Internexus Networks Limited |
| +44 1740481 | Allocated | Hello Telecom (UK) Limited |
| +44 1740482 | Allocated | Bicom Systems EURL |
| +44 1740483 | Allocated | 8x8 Communications UK Limited |
| +44 1740484 | Protected | — |
| +44 1740485 | Allocated | ICC Networks Ltd |
| +44 1740486 | Allocated | Ziron Limited |
| +44 1740487 | Allocated | IOVOX Limited |
| +44 1740488 | Allocated | Invoco Ltd |
| +44 1740489 | Protected | — |
| +44 1740490 | Allocated | Minotaur Telecom Limited |
| +44 1740491 | Allocated | Nuso Cloud UK Limited |
| +44 1740492 | Allocated | Kalnet4U Ltd |
| +44 1740493 | Allocated | Fuse 2 Communications Ltd |
| +44 1740494 | Protected | — |
| +44 1740495 | Allocated | Sky UK Limited |
| +44 1740496 | Allocated | Redwood Technologies Ltd |
| +44 1740497 | Allocated | XoverX Ltd |
| +44 1740498 | Allocated | Simwood eSMS Limited |
| +44 1740499 | Allocated | Content Guru Limited |
| +44 1740500 | Protected | — |
| +44 1740501 | Protected | — |
| +44 1740502 | Protected | — |
| +44 1740503 | Protected | — |
| +44 1740504 | Allocated | Six Degrees Technology Group Limited |
| +44 1740505 | Protected | — |
| +44 1740506 | Protected | — |
| +44 1740507 | Protected | — |
| +44 1740508 | Protected | — |
| +44 1740509 | Protected | — |
| +44 174051 | Allocated | Flextel Limited |
| +44 174052 | Protected | — |
| +44 1740530 | Protected | — |
| +44 1740531 | Protected | — |
| +44 1740532 | Protected | — |
| +44 1740533 | Protected | — |
| +44 1740534 | Protected | — |
| +44 1740535 | Protected | — |
| +44 1740536 | Protected | — |
| +44 1740537 | Protected | — |
| +44 1740538 | Protected | — |
| +44 1740539 | Protected | — |
| +44 174054 | Protected | — |
| +44 1740550 | Allocated | TGL Services (UK) Ltd |
| +44 1740551 | Free | — |
| +44 1740552 | Free | — |
| +44 1740553 | Free | — |
| +44 1740554 | Free | — |
| +44 1740555 | Allocated | VoiceHost Limited |
| +44 1740556 | Protected | — |
| +44 1740557 | Protected | — |
| +44 1740558 | Protected | — |
| +44 1740559 | Protected | — |
| +44 174056 | Allocated | Barritel Limited |
| +44 1740570 | Protected | — |
| +44 1740571 | Protected | — |
| +44 1740572 | Protected | — |
| +44 1740573 | Protected | — |
| +44 1740574 | Protected | — |
| +44 1740575 | Protected | — |
| +44 1740576 | Protected | — |
| +44 1740577 | Allocated | Spitfire Network Services Limited |
| +44 1740578 | Protected | — |
| +44 1740579 | Protected | — |
| +44 174058 | Allocated | AQL Wholesale Ltd |
| +44 174059 | Allocated | TTNC Limited |
| +44 1740600 | Allocated | Virgin Media Limited |
| +44 1740601 | Allocated | Virgin Media Limited |
| +44 1740602 | Allocated | Virgin Media Limited |
| +44 1740603 | Protected | — |
| +44 1740604 | Protected | — |
| +44 1740605 | Allocated | Virgin Media Limited |
| +44 1740606 | Allocated | Virgin Media Limited |
| +44 1740607 | Allocated | Virgin Media Limited |
| +44 1740608 | Allocated | Virgin Media Limited |
| +44 1740609 | Allocated | Virgin Media Limited |
| +44 1740610 | Protected | — |
| +44 1740611 | Protected | — |
| +44 1740612 | Protected | — |
| +44 1740613 | Protected | — |
| +44 1740614 | Protected | — |
| +44 1740615 | Allocated | Gamma Telecom Holdings Limited |
| +44 1740616 | Allocated | Gamma Telecom Holdings Limited |
| +44 1740617 | Allocated | Gamma Telecom Holdings Limited |
| +44 1740618 | Allocated | Gamma Telecom Holdings Limited |
| +44 1740619 | Allocated | Gamma Telecom Holdings Limited |
| +44 174062 | Allocated | BT |
| +44 174063 | Allocated | BT |
| +44 174064 | Allocated | BT |
| +44 174065 | Allocated | BT |
| +44 174066 | Allocated | BT |
| +44 174067 | Allocated | GCI Network Solutions Limited |
| +44 174068 | Protected | — |
| +44 1740690 | Allocated | Digitech Solutions Global Limited |
| +44 1740691 | Protected | — |
| +44 1740692 | Protected | — |
| +44 1740693 | Protected | — |
| +44 1740694 | Protected | — |
| +44 1740695 | Protected | — |
| +44 1740696 | Protected | — |
| +44 1740697 | Protected | — |
| +44 1740698 | Protected | — |
| +44 1740699 | Protected | — |
| +44 1740700 | Protected | — |
| +44 1740701 | Protected | — |
| +44 1740702 | Protected | — |
| +44 1740703 | Protected | — |
Related lookups
- 01325 Darlington17 km away
- 01429 Hartlepool24 km away
- 01833 Barnard Castle25 km away
- 01207 Consett26 km away
- Virgin Media Limited12 allocated blocks on 01740
- GCI Network Solutions Limited11 allocated blocks on 01740
- BT7 allocated blocks on 01740
- All UK towns A–ZDialling codes by town
- More County Durham 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 01740
Where is area code 01740?
01740 is Ofcom's Sedgefield numbering area, in Durham, North East England. Its exchange town is in County Durham. From abroad, drop the 0 and dial +44 1740.
Do I need to dial 01740 for a local call?
Traditionally not from another 01740 landline, but it now depends on your provider: Ofcom stopped requiring providers to offer local (code-free) dialling on 11 March 2022. Dialling 01740 first always works, and mobiles always need it.
How are 01740 numbers written?
Numbers on 01740 use Ofcom's 4+6 format: the 5-digit code (including the leading 0) followed by a 6-digit local number — written like 01740 234 567. From abroad the leading zero is dropped: +44 1740 then the local number.
What was the 01740 area code before?
01740 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 0740. Old signage or stationery showing 0740 refers to the same Sedgefield numbers.
Which phone companies hold 01740 numbers?
Ofcom lists 88 providers with allocated blocks on 01740. The largest are Virgin Media Limited with 12 of the 128 allocated blocks, GCI Network Solutions Limited with 11 of the 128 allocated blocks and BT with 7 of the 128 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 01740?
By distance between exchange towns, the nearest other codes are 01325 Darlington (17 km), 01429 Hartlepool (24 km), 01833 Barnard Castle (25 km) and 01207 Consett (26 km).
How do I report a scam call from a 01740 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 Report Fraud (0300 123 2040), which replaced Action Fraud in December 2025. Unwanted sales calls go to the ICO after registering with the Telephone Preference Service.