UK area code
01638 area code — Newmarket
01638 is Ofcom’s Newmarket numbering area, in Suffolk, East of England England. 92 phone companies hold its 144 allocated number blocks. Its numbers are written like 01638 234 567. The nearest other codes are 01440 Haverhill (18 km) and 01223 Cambridge (19 km).
01638 at a glance
- Ofcom area name
- Newmarket
- County
- Suffolk
- Council area
- Suffolk
- Region
- East of England England
- Number format
- 01638 234 567 (4+6)
- Local calls
- Full number recommended
- Current code since
- 1995 (previously 0638)
- Allocated blocks
- 144 of 442 (33%) across 92 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 01638 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.
01638 history and number format
Number format: Numbers on 01638 use Ofcom's 4+6 format: the 5-digit code (including the leading 0) followed by a 6-digit local number — written like 01638 234 567.
Before 1995: 01638 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 0638.
Local dialling: Traditionally not from another 01638 landline, but it now depends on your provider: Ofcom stopped requiring providers to offer local (code-free) dialling on 11 March 2022. Dialling 01638 first always works, and mobiles always need it.
Allocation record: the oldest number block still visible on 01638 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 01638 number rings (see the weekly numbering changelog for every new allocation.)
Phone companies holding 01638 numbers
Every Ofcom range holder with blocks on 01638, 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 | 23 | 23 | 15 July 1994 | 3 March 2023 |
| GCI Network Solutions Limited | 11 | 11 | 2 May 2017 | 26 February 2024 |
| Sky UK Limited | 8 | 8 | 20 June 2013 | 19 August 2025 |
| Vodafone Ltd (C&W) | 7 | 7 | 9 September 2013 | 10 November 2021 |
| TalkTalk Communications Limited | 4 | 4 | 20 January 2012 | 12 February 2013 |
| Colt Technology Services | 2 | 2 | 1 May 2015 | 23 July 2018 |
| Fuse 2 Communications Ltd | 2 | 2 | 3 July 2017 | 22 January 2024 |
| Six Degrees Technology Group Limited | 2 | 2 | 8 April 2020 | 8 April 2020 |
| Virgin Media Limited | 2 | 2 | 15 July 1994 | 15 July 1994 |
| (AQ) LIMITED | 1 | 1 | 12 September 2012 | 12 September 2012 |
| 24 Seven Cloud Communications Ltd | 1 | 1 | 17 January 2020 | 17 January 2020 |
| 8x8 Communications UK Limited | 1 | 1 | 5 April 2012 | 5 April 2012 |
| AQL Wholesale Ltd | 1 | 1 | 1 November 2004 | 1 November 2004 |
| Adepteo Limited | 1 | 1 | 6 December 2016 | 6 December 2016 |
| Andrews & Arnold (Numbers) Ltd | 1 | 1 | 25 March 2009 | 25 March 2009 |
| Atomstream Limited | 1 | 1 | 23 March 2010 | 23 March 2010 |
| Barritel Limited | 1 | 1 | 22 June 2007 | 22 June 2007 |
| Belgacom International Carrier Services SA | 1 | 1 | 9 April 2020 | 9 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 | 23 September 2013 | 23 September 2013 |
| Content Guru Limited | 1 | 1 | 12 October 2012 | 12 October 2012 |
| Convergence Group (wireless) Networks Limited | 1 | 1 | 21 May 2019 | 21 May 2019 |
| Core Telecom Limited | 1 | 1 | 6 August 2010 | 6 August 2010 |
| DIDWW Ireland Limited | 1 | 1 | 21 January 2019 | 21 January 2019 |
| Datazero Ltd | 1 | 1 | 2 November 2010 | 2 November 2010 |
| Dial 9 Communications Limited | 1 | 1 | 10 December 2019 | 10 December 2019 |
| Digital Space Group Limited | 1 | 1 | 15 March 2016 | 15 March 2016 |
| Digitech Solutions Global Limited | 1 | 1 | 28 April 2010 | 28 April 2010 |
Showing the 30 largest of 92 holders.
All number blocks on 01638first 200 of 442, by prefix
| Prefix | Status | Range holder |
|---|---|---|
| +44 163800 | Protected | — |
| +44 163801 | Protected | — |
| +44 163802 | Protected | — |
| +44 163803 | Protected | — |
| +44 163804 | Protected | — |
| +44 163805 | Protected | — |
| +44 163806 | Protected | — |
| +44 163807 | Protected | — |
| +44 163808 | Protected | — |
| +44 163809 | Protected | — |
| +44 163810 | Allocated | BT |
| +44 163811 | Protected | — |
| +44 163812 | Protected | — |
| +44 163813 | Protected | — |
| +44 163814 | Allocated | BT |
| +44 163815 | Protected | — |
| +44 163816 | Protected | — |
| +44 163817 | Protected | — |
| +44 163818 | Protected | — |
| +44 163819 | Protected | — |
| +44 1638200 | Protected | — |
| +44 1638201 | Protected | — |
| +44 1638202 | Protected | — |
| +44 1638203 | Protected | — |
| +44 1638204 | Protected | — |
| +44 1638205 | Protected | — |
| +44 1638206 | Protected | — |
| +44 1638207 | Protected | — |
| +44 1638208 | Protected | — |
| +44 1638209 | Protected | — |
| +44 163821 | Allocated | TelNG Limited |
| +44 163822 | Protected | — |
| +44 1638230 | Protected | — |
| +44 1638231 | Protected | — |
| +44 1638232 | Protected | — |
| +44 1638233 | Protected | — |
| +44 1638234 | Protected | — |
| +44 1638235 | Protected | — |
| +44 1638236 | Protected | — |
| +44 1638237 | Protected | — |
| +44 1638238 | Protected | — |
| +44 1638239 | Protected | — |
| +44 163824 | Allocated | Redcentric Solutions Limited |
| +44 163825 | Allocated | Barritel Limited |
| +44 163826 | Allocated | Voiceflex Limited |
| +44 1638270 | Protected | — |
| +44 1638271 | Protected | — |
| +44 1638272 | Protected | — |
| +44 1638273 | Protected | — |
| +44 1638274 | Protected | — |
| +44 1638275 | Protected | — |
| +44 1638276 | Protected | — |
| +44 1638277 | Allocated | Spitfire Network Services Limited |
| +44 1638278 | Protected | — |
| +44 1638279 | Protected | — |
| +44 163828 | Allocated | TTNC Limited |
| +44 163829 | Protected | — |
| +44 163830 | Allocated | Localphone Limited |
| +44 1638310 | Allocated | Linear Telecoms Limited |
| +44 1638311 | Allocated | Inet Telecoms Ltd (Voipfone) |
| +44 1638312 | Protected | — |
| +44 1638313 | Allocated | Internexus Networks Limited |
| +44 1638314 | Allocated | Bicom Systems EURL |
| +44 1638315 | Protected | — |
| +44 1638316 | Allocated | 8x8 Communications UK Limited |
| +44 1638317 | Allocated | ICC Networks Ltd |
| +44 1638318 | Allocated | IOVOX Limited |
| +44 1638319 | Allocated | Ziron Limited |
| +44 1638320 | Protected | — |
| +44 1638321 | Protected | — |
| +44 1638322 | Protected | — |
| +44 1638323 | Protected | — |
| +44 1638324 | Protected | — |
| +44 1638325 | Protected | — |
| +44 1638326 | Protected | — |
| +44 1638327 | Protected | — |
| +44 1638328 | Protected | — |
| +44 1638329 | Protected | — |
| +44 1638330 | Protected | — |
| +44 1638331 | Allocated | Sky UK Limited |
| +44 1638332 | Allocated | VOXYONDER NETWORK SERVICES UK LTD |
| +44 1638333 | Allocated | VoiceHost Limited |
| +44 1638334 | Allocated | I.T Communications Limited |
| +44 1638335 | Allocated | Adepteo Limited |
| +44 1638336 | Allocated | IP Voice Networks Ltd |
| +44 1638337 | Allocated | Zapappi Ltd |
| +44 1638338 | Allocated | Number Services Ltd. |
| +44 1638339 | Allocated | Invosys Limited |
| +44 163834 | Allocated | Flextel Limited |
| +44 1638350 | Allocated | EVE CONNECT LTD |
| +44 1638351 | Allocated | 24 Seven Cloud Communications Ltd |
| +44 1638352 | Allocated | Mi Telecom Limited |
| +44 1638353 | Allocated | DIDWW Ireland Limited |
| +44 1638354 | Allocated | BT |
| +44 1638355 | Allocated | ICUK Computing Services Limited |
| +44 1638356 | Allocated | Belgacom International Carrier Services SA |
| +44 1638357 | Allocated | SiPalto Ltd |
| +44 1638358 | Allocated | Colt Technology Services |
| +44 1638359 | Allocated | Dial 9 Communications Limited |
| +44 163836 | Protected | — |
| +44 163837 | Protected | — |
| +44 163838 | Allocated | Vodafone Ltd (C&W) |
| +44 1638390 | Allocated | Six Degrees Technology Group Limited |
| +44 1638391 | Protected | — |
| +44 1638392 | Protected | — |
| +44 1638393 | Protected | — |
| +44 1638394 | Allocated | Six Degrees Technology Group Limited |
| +44 1638395 | Protected | — |
| +44 1638396 | Protected | — |
| +44 1638397 | Protected | — |
| +44 1638398 | Protected | — |
| +44 1638399 | Protected | — |
| +44 163840 | Allocated | Net-Work Internet Ltd |
| +44 163841 | Allocated | VoIP-Un Limited |
| +44 1638420 | Protected | — |
| +44 1638421 | Protected | — |
| +44 1638422 | Protected | — |
| +44 1638423 | Protected | — |
| +44 1638424 | Protected | — |
| +44 1638425 | Protected | — |
| +44 1638426 | Protected | — |
| +44 1638427 | Allocated | TalkTalk Communications Limited |
| +44 1638428 | Allocated | TalkTalk Communications Limited |
| +44 1638429 | Allocated | TalkTalk Communications Limited |
| +44 1638430 | Allocated | Nodemax Limited |
| +44 1638431 | Quarantined | — |
| +44 1638432 | Protected | — |
| +44 1638433 | Protected | — |
| +44 1638434 | Allocated | Served Up Limited |
| +44 1638435 | Allocated | Solutios Limited |
| +44 1638436 | Allocated | Telecom2 Limited |
| +44 1638437 | Allocated | Digital Space Group Limited |
| +44 1638438 | Allocated | Voxbone SA |
| +44 1638439 | Allocated | Mars Communications Limited |
| +44 1638440 | Allocated | GCI Network Solutions Limited |
| +44 1638441 | Allocated | GCI Network Solutions Limited |
| +44 1638442 | Allocated | GCI Network Solutions Limited |
| +44 1638443 | Allocated | GCI Network Solutions Limited |
| +44 1638444 | Allocated | GCI Network Solutions Limited |
| +44 1638445 | Allocated | GCI Network Solutions Limited |
| +44 1638446 | Allocated | GCI Network Solutions Limited |
| +44 1638447 | Allocated | GCI Network Solutions Limited |
| +44 1638448 | Allocated | GCI Network Solutions Limited |
| +44 1638449 | Allocated | GCI Network Solutions Limited |
| +44 1638450 | Allocated | Andrews & Arnold (Numbers) Ltd |
| +44 1638451 | Allocated | KCOM Group Ltd |
| +44 1638452 | Allocated | Invade International Ltd |
| +44 1638453 | Allocated | Telecoms World Direct Limited |
| +44 1638454 | Allocated | Sky UK Limited |
| +44 1638455 | Quarantined | — |
| +44 1638456 | Allocated | CFL Communications Ltd |
| +44 1638457 | Protected | — |
| +44 1638458 | Allocated | Nexus Telecommunications Limited |
| +44 1638459 | Allocated | Nuso Cloud UK Limited |
| +44 1638460 | Allocated | Verizon UK Limited |
| +44 1638461 | Allocated | Digitech Solutions Global Limited |
| +44 1638462 | Allocated | Atomstream Limited |
| +44 1638463 | Allocated | Calltracks Limited |
| +44 1638464 | Allocated | Suretec Systems Ltd |
| +44 1638465 | Allocated | Windsor Telecom Limited |
| +44 1638466 | Protected | — |
| +44 1638467 | Allocated | Simwood eSMS Limited |
| +44 1638468 | Allocated | Core Telecom Limited |
| +44 1638469 | Allocated | Telephone Box Limited |
| +44 1638470 | Allocated | Datazero Ltd |
| +44 1638471 | Protected | — |
| +44 1638472 | Allocated | Phone Co-Op Numbering Limited |
| +44 1638473 | Protected | — |
| +44 1638474 | Allocated | INTELLIGENT EXCHANGES LIMITED |
| +44 1638475 | Allocated | BT |
| +44 1638476 | Allocated | BT |
| +44 1638477 | Allocated | Lanonyx Telecom Limited |
| +44 1638478 | Allocated | Bink Networks Ltd |
| +44 1638479 | Protected | — |
| +44 1638480 | Allocated | Nexbridge Communications Limited |
| +44 1638481 | Allocated | TeleWare Group Limited |
| +44 1638482 | Allocated | Sky UK Limited |
| +44 1638483 | Protected | — |
| +44 1638484 | Allocated | TalkTalk Communications Limited |
| +44 1638485 | Allocated | Orbtalk Limited |
| +44 1638486 | Protected | — |
| +44 1638487 | Protected | — |
| +44 1638488 | Protected | — |
| +44 1638489 | Protected | — |
| +44 1638490 | Allocated | Sky UK Limited |
| +44 1638491 | Allocated | Vonage Business Limited |
| +44 1638492 | Allocated | Colt Technology Services |
| +44 1638493 | Allocated | Sky UK Limited |
| +44 1638494 | Allocated | Fuse 2 Communications Ltd |
| +44 1638495 | Allocated | YayYay Limited |
| +44 1638496 | Allocated | Fuse 2 Communications Ltd |
| +44 1638497 | Allocated | Mintaka Limited |
| +44 1638498 | Allocated | Convergence Group (wireless) Networks Limited |
| +44 1638499 | Allocated | Invoco Ltd |
| +44 163850 | Allocated | BT |
| +44 163851 | Allocated | BT |
| +44 163852 | Allocated | BT |
| +44 163853 | Allocated | BT |
| +44 163854 | Allocated | BT |
| +44 163855 | Allocated | BT |
Related lookups
- 01440 Haverhill18 km away
- 01223 Cambridge19 km away
- 01353 Ely20 km away
- 01284 Bury St Edmunds21 km away
- BT23 allocated blocks on 01638
- GCI Network Solutions Limited11 allocated blocks on 01638
- Sky UK Limited8 allocated blocks on 01638
- All UK towns A–ZDialling codes by town
- More Suffolk 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 01638
Where is area code 01638?
01638 is Ofcom's Newmarket numbering area, in Suffolk, East of England England. Its exchange town is in Suffolk. From abroad, drop the 0 and dial +44 1638.
Do I need to dial 01638 for a local call?
Traditionally not from another 01638 landline, but it now depends on your provider: Ofcom stopped requiring providers to offer local (code-free) dialling on 11 March 2022. Dialling 01638 first always works, and mobiles always need it.
How are 01638 numbers written?
Numbers on 01638 use Ofcom's 4+6 format: the 5-digit code (including the leading 0) followed by a 6-digit local number — written like 01638 234 567. From abroad the leading zero is dropped: +44 1638 then the local number.
What was the 01638 area code before?
01638 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 0638. Old signage or stationery showing 0638 refers to the same Newmarket numbers.
Which phone companies hold 01638 numbers?
Ofcom lists 92 providers with allocated blocks on 01638. The largest are BT with 23 of the 144 allocated blocks, GCI Network Solutions Limited with 11 of the 144 allocated blocks and Sky UK Limited with 8 of the 144 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 01638?
By distance between exchange towns, the nearest other codes are 01440 Haverhill (18 km), 01223 Cambridge (19 km), 01353 Ely (20 km) and 01284 Bury St Edmunds (21 km).
How do I report a scam call from a 01638 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.