UK area code
01245 area code — Chelmsford
01245 is Ofcom’s Chelmsford numbering area, in Essex, East of England England. 114 phone companies hold its 247 allocated number blocks. Its numbers are written like 01245 234 567. The nearest other codes are 01621 Maldon (14 km) and 01376 Braintree (17 km).
01245 at a glance
- Ofcom area name
- Chelmsford
- County
- Essex
- Council area
- Essex
- Region
- East of England England
- Number format
- 01245 234 567 (4+6)
- Local calls
- Full number recommended
- Current code since
- 1995 (previously 0245)
- Allocated blocks
- 247 of 388 (64%) across 114 providers
- Newest block
- 20 July 2026 (4 in the last 12 months)
Sources: Ofcom numbering data (weekly) and area-code list, Ofcom Numbering Plan, ONS geography.
If a 01245 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.
01245 history and number format
Number format: Numbers on 01245 use Ofcom's 4+6 format: the 5-digit code (including the leading 0) followed by a 6-digit local number — written like 01245 234 567.
Before 1995: 01245 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 0245.
Local dialling: Traditionally not from another 01245 landline, but it now depends on your provider: Ofcom stopped requiring providers to offer local (code-free) dialling on 11 March 2022. Dialling 01245 first always works, and mobiles always need it.
Allocation record: the oldest number block still visible on 01245 was allocated on 15 July 1994, and the most recent on 20 July 2026. 4 blocks were allocated in the last 12 months — newly-activated ranges with no call history, which is worth knowing when an unfamiliar 01245 number rings (see the weekly numbering changelog for every new allocation.)
Phone companies holding 01245 numbers
Every Ofcom range holder with blocks on 01245, 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 |
|---|---|---|---|---|
| BT | 36 | 36 | 15 July 1994 | 5 June 2025 |
| Gamma Telecom Holdings Limited | 18 | 18 | 5 April 2004 | 20 July 2026 |
| Sky UK Limited | 15 | 15 | 24 June 2013 | 18 June 2021 |
| Virgin Media Limited | 13 | 13 | 4 September 2006 | 17 March 2016 |
| Vodafone Ltd (C&W) | 10 | 10 | 3 October 2013 | 17 November 2021 |
| TalkTalk Communications Limited | 8 | 8 | 31 August 2011 | 13 April 2018 |
| Colt Technology Services | 7 | 7 | 21 October 2011 | 10 July 2026 |
| GCI Network Solutions Limited | 6 | 6 | 19 April 2017 | 22 December 2023 |
| Magrathea Telecommunications Limited | 6 | 6 | 16 November 2011 | 16 November 2011 |
| Lumen Technologies UK Limited | 5 | 5 | 25 July 2011 | 25 July 2011 |
| Barritel Limited | 4 | 4 | 13 February 2006 | 2 December 2022 |
| Digital Space Group Limited | 3 | 3 | 29 November 2007 | 12 April 2016 |
| IOVOX Limited | 3 | 3 | 3 April 2012 | 23 December 2016 |
| WAVECREST NETWORKS LIMITED | 3 | 3 | 16 December 2019 | 16 December 2019 |
| DRD Communications Limited | 2 | 2 | 5 October 2023 | 5 October 2023 |
| Datazero Ltd | 2 | 2 | 8 November 2010 | 29 April 2019 |
| Fuse 2 Communications Ltd | 2 | 2 | 3 July 2017 | 22 January 2024 |
| Infinity Tracking Ltd | 2 | 2 | 22 March 2019 | 9 April 2019 |
| Media Hawk Ltd | 2 | 2 | 26 September 2011 | 21 October 2015 |
| Served Up Limited | 2 | 2 | 1 March 2013 | 1 March 2013 |
| Six Degrees Technology Group Limited | 2 | 2 | 14 January 2020 | 14 January 2020 |
| Twilio Ireland Limited | 2 | 2 | 13 October 2020 | 19 August 2024 |
| Voiceflex Limited | 2 | 2 | 24 July 2007 | 20 March 2024 |
| Voxbone SA | 2 | 2 | 18 September 2008 | 3 April 2024 |
| (AQ) LIMITED | 1 | 1 | 17 October 2011 | 17 October 2011 |
| 24 Seven Cloud Communications Ltd | 1 | 1 | 17 January 2020 | 17 January 2020 |
| 8x8 UK Limited | 1 | 1 | 19 February 2010 | 19 February 2010 |
| AQL Wholesale Ltd | 1 | 1 | 1 November 2004 | 1 November 2004 |
| Adepteo Limited | 1 | 1 | 16 January 2017 | 16 January 2017 |
| Alnitak GmbH | 1 | 1 | 14 January 2016 | 14 January 2016 |
Showing the 30 largest of 114 holders.
Openreach exchanges at Chelmsford
Exchanges Openreach lists at this location in its copper stop-sell programme, with the date new copper orders stop.
- Boreham EABORStop sell Removed from stop sell · N/A
- Chelmsford EACHEStop sell 17-Feb-25 · Tranche 15
- Roxwell EAROXStop sell 26-May-25 · Tranche 16
All number blocks on 01245first 200 of 388, by prefix
| Prefix | Status | Range holder |
|---|---|---|
| +44 124500 | Allocated | Barritel Limited |
| +44 124501 | Protected | — |
| +44 124502 | Protected | — |
| +44 124503 | Protected | — |
| +44 124504 | Protected | — |
| +44 124505 | Protected | — |
| +44 124506 | Protected | — |
| +44 124507 | Protected | — |
| +44 124508 | Protected | — |
| +44 124509 | Protected | — |
| +44 124510 | Protected | — |
| +44 1245110 | Protected | — |
| +44 1245111 | Protected | — |
| +44 1245112 | Protected | — |
| +44 1245113 | Protected | — |
| +44 1245114 | Protected | — |
| +44 1245115 | Protected | — |
| +44 1245116 | Protected | — |
| +44 1245117 | Protected | — |
| +44 1245118 | Protected | — |
| +44 1245119 | Protected | — |
| +44 124512 | Protected | — |
| +44 124513 | Protected | — |
| +44 124514 | Allocated | Virgin Media Limited |
| +44 124515 | Protected | — |
| +44 124516 | Protected | — |
| +44 124517 | Protected | — |
| +44 124518 | Protected | — |
| +44 124519 | Protected | — |
| +44 124520 | Allocated | Gamma Telecom Holdings Limited |
| +44 124521 | Allocated | BT |
| +44 124522 | Allocated | BT |
| +44 124523 | Allocated | BT |
| +44 124524 | Allocated | BT |
| +44 124525 | Allocated | BT |
| +44 124526 | Allocated | BT |
| +44 124527 | Allocated | BT |
| +44 124528 | Allocated | BT |
| +44 124529 | Allocated | BT |
| +44 124530 | Allocated | TalkTalk Communications Limited |
| +44 124531 | Allocated | BT |
| +44 124532 | Allocated | BT |
| +44 124533 | Allocated | AQL Wholesale Ltd |
| +44 124534 | Allocated | BT |
| +44 124535 | Allocated | BT |
| +44 124536 | Allocated | BT |
| +44 1245370 | Allocated | Linear Telecoms Limited |
| +44 1245371 | Allocated | Media Hawk Ltd |
| +44 1245372 | Protected | — |
| +44 1245373 | Allocated | Colt Technology Services |
| +44 1245374 | Allocated | Internexus Networks Limited |
| +44 1245375 | Allocated | Bicom Systems EURL |
| +44 1245376 | Allocated | ICC Networks Ltd |
| +44 1245377 | Allocated | Simwood eSMS Limited |
| +44 1245378 | Allocated | IOVOX Limited |
| +44 1245379 | Allocated | Ziron Limited |
| +44 124538 | Allocated | BT |
| +44 124539 | Allocated | BT |
| +44 124540 | Allocated | BT |
| +44 1245410 | Allocated | DRD Communications Limited |
| +44 1245411 | Protected | — |
| +44 1245412 | Allocated | DRD Communications Limited |
| +44 1245413 | Protected | — |
| +44 1245414 | Allocated | Truespeed Communications Ltd |
| +44 1245415 | Allocated | Colt Technology Services |
| +44 1245416 | Allocated | BT |
| +44 1245417 | Protected | — |
| +44 1245418 | Protected | — |
| +44 1245419 | Protected | — |
| +44 124542 | Allocated | BT |
| +44 124543 | Allocated | Gamma Telecom Holdings Limited |
| +44 124544 | Allocated | BT |
| +44 124545 | Allocated | BT |
| +44 124546 | Allocated | BT |
| +44 124547 | Allocated | BT |
| +44 124548 | Allocated | Barritel Limited |
| +44 124549 | Allocated | BT |
| +44 124550 | Allocated | BT |
| +44 124551 | Allocated | BT |
| +44 1245520 | Allocated | Liquid 11 Limited |
| +44 1245521 | Allocated | Sky UK Limited |
| +44 1245522 | Allocated | Fuse 2 Communications Ltd |
| +44 1245523 | Allocated | Sky UK Limited |
| +44 1245524 | Allocated | Vodafone Ltd (C&W) |
| +44 1245525 | Allocated | Vodafone Ltd (C&W) |
| +44 1245526 | Allocated | Kalnet4U Ltd |
| +44 1245527 | Allocated | Invoco Ltd |
| +44 1245528 | Allocated | Vodafone Ltd (C&W) |
| +44 1245529 | Allocated | Vodafone Ltd (C&W) |
| +44 1245530 | Allocated | Hyperoptic Ltd |
| +44 1245531 | Allocated | Colt Technology Services |
| +44 1245532 | Allocated | Gamma Telecom Holdings Limited |
| +44 1245533 | Free | — |
| +44 1245534 | Free | — |
| +44 1245535 | Free | — |
| +44 1245536 | Free | — |
| +44 1245537 | Free | — |
| +44 1245538 | Protected | — |
| +44 1245539 | Protected | — |
| +44 124554 | Allocated | BT |
| +44 1245550 | Allocated | Lumen Technologies UK Limited |
| +44 1245551 | Protected | — |
| +44 1245552 | Allocated | Lumen Technologies UK Limited |
| +44 1245553 | Allocated | Lumen Technologies UK Limited |
| +44 1245554 | Protected | — |
| +44 1245555 | Allocated | Lumen Technologies UK Limited |
| +44 1245556 | Protected | — |
| +44 1245557 | Protected | — |
| +44 1245558 | Protected | — |
| +44 1245559 | Allocated | Lumen Technologies UK Limited |
| +44 124556 | Allocated | Vodafone Ltd (C&W) |
| +44 124557 | Allocated | GCI Network Solutions Limited |
| +44 1245580 | Allocated | Six Degrees Technology Group Limited |
| +44 1245581 | Protected | — |
| +44 1245582 | Protected | — |
| +44 1245583 | Protected | — |
| +44 1245584 | Allocated | Six Degrees Technology Group Limited |
| +44 1245585 | Protected | — |
| +44 1245586 | Protected | — |
| +44 1245587 | Protected | — |
| +44 1245588 | Protected | — |
| +44 1245589 | Protected | — |
| +44 124559 | Allocated | Vodafone Ltd (C&W) |
| +44 124560 | Allocated | Virgin Media Limited |
| +44 124561 | Allocated | Virgin Media Limited |
| +44 1245620 | Protected | — |
| +44 1245621 | Protected | — |
| +44 1245622 | Protected | — |
| +44 1245623 | Allocated | Digital Space Group Limited |
| +44 1245624 | Protected | — |
| +44 1245625 | Protected | — |
| +44 1245626 | Protected | — |
| +44 1245627 | Protected | — |
| +44 1245628 | Protected | — |
| +44 1245629 | Protected | — |
| +44 1245630 | Allocated | Sky UK Limited |
| +44 1245631 | Allocated | Sky UK Limited |
| +44 1245632 | Allocated | Sky UK Limited |
| +44 1245633 | Allocated | Sky UK Limited |
| +44 1245634 | Protected | — |
| +44 1245635 | Protected | — |
| +44 1245636 | Protected | — |
| +44 1245637 | Protected | — |
| +44 1245638 | Protected | — |
| +44 1245639 | Protected | — |
| +44 124564 | Allocated | Citrus Telecommunications Ltd |
| +44 1245650 | Protected | — |
| +44 1245651 | Protected | — |
| +44 1245652 | Protected | — |
| +44 1245653 | Protected | — |
| +44 1245654 | Protected | — |
| +44 1245655 | Protected | — |
| +44 1245656 | Protected | — |
| +44 1245657 | Protected | — |
| +44 1245658 | Allocated | Vodafone Ltd (C&W) |
| +44 1245659 | Allocated | Vodafone Ltd (C&W) |
| +44 124566 | Allocated | TGL Services (UK) Ltd |
| +44 1245670 | Allocated | Internet of Things Limited |
| +44 1245671 | Allocated | Media Hawk Ltd |
| +44 1245672 | Allocated | Sky UK Limited |
| +44 1245673 | Allocated | Gamma Telecom Holdings Limited |
| +44 1245674 | Allocated | Bink Broadband Ltd |
| +44 1245675 | Allocated | Sky UK Limited |
| +44 1245676 | Allocated | GCI Network Solutions Limited |
| +44 1245677 | Allocated | Sky UK Limited |
| +44 1245678 | Allocated | Gamma Telecom Holdings Limited |
| +44 1245679 | Allocated | IOVOX Limited |
| +44 1245680 | Protected | — |
| +44 1245681 | Allocated | Virgin Media Limited |
| +44 1245682 | Allocated | Virgin Media Limited |
| +44 1245683 | Allocated | Virgin Media Limited |
| +44 1245684 | Allocated | Virgin Media Limited |
| +44 1245685 | Allocated | Virgin Media Limited |
| +44 1245686 | Allocated | Virgin Media Limited |
| +44 1245687 | Allocated | Virgin Media Limited |
| +44 1245688 | Allocated | Virgin Media Limited |
| +44 1245689 | Protected | — |
| +44 1245690 | Allocated | TalkTalk Communications Limited |
| +44 1245691 | Protected | — |
| +44 1245692 | Protected | — |
| +44 1245693 | Protected | — |
| +44 1245694 | Protected | — |
| +44 1245695 | Protected | — |
| +44 1245696 | Protected | — |
| +44 1245697 | Allocated | TalkTalk Communications Limited |
| +44 1245698 | Allocated | TalkTalk Communications Limited |
| +44 1245699 | Allocated | TalkTalk Communications Limited |
| +44 124570 | Allocated | Vodafone Ltd (C&W) |
| +44 124571 | Allocated | Invade International Ltd |
| +44 1245720 | Protected | — |
| +44 1245721 | Protected | — |
| +44 1245722 | Allocated | GTT-EMEA LTD |
| +44 1245723 | Protected | — |
| +44 1245724 | Protected | — |
| +44 1245725 | Protected | — |
| +44 1245726 | Protected | — |
| +44 1245727 | Protected | — |
| +44 1245728 | Protected | — |
| +44 1245729 | Protected | — |
| +44 124573 | Allocated | Flextel Limited |
Related lookups
- 01621 Maldon14 km away
- 01376 Braintree17 km away
- 01371 Great Dunmow17 km away
- 01277 Brentwood17 km away
- BT36 allocated blocks on 01245
- Gamma Telecom Holdings Limited18 allocated blocks on 01245
- Sky UK Limited15 allocated blocks on 01245
- All UK towns A–ZDialling codes by town
- More Essex 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 01245
Where is area code 01245?
01245 is Ofcom's Chelmsford numbering area, in Essex, East of England England. Its exchange town is in Essex. From abroad, drop the 0 and dial +44 1245.
Do I need to dial 01245 for a local call?
Traditionally not from another 01245 landline, but it now depends on your provider: Ofcom stopped requiring providers to offer local (code-free) dialling on 11 March 2022. Dialling 01245 first always works, and mobiles always need it.
How are 01245 numbers written?
Numbers on 01245 use Ofcom's 4+6 format: the 5-digit code (including the leading 0) followed by a 6-digit local number — written like 01245 234 567. From abroad the leading zero is dropped: +44 1245 then the local number.
What was the 01245 area code before?
01245 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 0245. Old signage or stationery showing 0245 refers to the same Chelmsford numbers.
Which phone companies hold 01245 numbers?
Ofcom lists 114 providers with allocated blocks on 01245. The largest are BT with 36 of the 247 allocated blocks, Gamma Telecom Holdings Limited with 18 of the 247 allocated blocks and Sky UK Limited with 15 of the 247 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 01245?
By distance between exchange towns, the nearest other codes are 01621 Maldon (14 km), 01376 Braintree (17 km), 01371 Great Dunmow (17 km) and 01277 Brentwood (17 km).
How do I report a scam call from a 01245 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.