UK area code
01433 area code — Hathersage
01433 is Ofcom’s Hathersage numbering area, in Derbyshire, East Midlands England. 78 phone companies hold its 102 allocated number blocks. Its numbers are written like 01433 234 567. The nearest other codes are 01246 Chesterfield (18 km) and 01298 Buxton (19 km).
01433 at a glance
- Ofcom area name
- Hathersage
- County
- Derbyshire
- Council area
- Derbyshire
- Region
- East Midlands England
- Number format
- 01433 234 567 (4+6)
- Local calls
- Full number recommended
- Current code since
- 1995 (previously 0433)
- Allocated blocks
- 102 of 460 (22%) across 78 providers
- Newest block
- 29 June 2026 (1 in the last 12 months)
Sources: Ofcom numbering data (weekly) and area-code list, Ofcom Numbering Plan, ONS geography.
If a 01433 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.
01433 history and number format
Number format: Numbers on 01433 use Ofcom's 4+6 format: the 5-digit code (including the leading 0) followed by a 6-digit local number — written like 01433 234 567.
Before 1995: 01433 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 0433.
Local dialling: Traditionally not from another 01433 landline, but it now depends on your provider: Ofcom stopped requiring providers to offer local (code-free) dialling on 11 March 2022. Dialling 01433 first always works, and mobiles always need it.
Allocation record: the oldest number block still visible on 01433 was allocated on 15 July 1994, and the most recent on 29 June 2026. 1 block was allocated in the last 12 months — newly-activated ranges with no call history, which is worth knowing when an unfamiliar 01433 number rings (see the weekly numbering changelog for every new allocation.)
Phone companies holding 01433 numbers
Every Ofcom range holder with blocks on 01433, 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 |
|---|---|---|---|---|
| GCI Network Solutions Limited | 11 | 11 | 20 December 2023 | 26 February 2024 |
| BT | 4 | 4 | 15 July 1994 | 15 July 1994 |
| Inet Telecoms Ltd (Voipfone) | 4 | 4 | 30 November 2009 | 30 November 2009 |
| Six Degrees Technology Group Limited | 3 | 3 | 14 January 2020 | 14 January 2020 |
| Vodafone Ltd (C&W) | 3 | 3 | 2 September 2013 | 15 November 2021 |
| Digital Space Group Limited | 2 | 2 | 30 November 2007 | 15 March 2016 |
| Fuse 2 Communications Ltd | 2 | 2 | 4 July 2017 | 22 January 2024 |
| Simwood eSMS Limited | 2 | 2 | 14 February 2012 | 29 June 2026 |
| TalkTalk Communications Limited | 2 | 2 | 19 January 2012 | 19 January 2012 |
| (AQ) LIMITED | 1 | 1 | 11 September 2012 | 11 September 2012 |
| 24 Seven Cloud Communications Ltd | 1 | 1 | 17 January 2020 | 17 January 2020 |
| 8x8 Communications UK Limited | 1 | 1 | 29 March 2012 | 29 March 2012 |
| AQL Wholesale Ltd | 1 | 1 | 26 June 2006 | 26 June 2006 |
| Adepteo Limited | 1 | 1 | 17 January 2017 | 17 January 2017 |
| Andrews & Arnold (Numbers) Ltd | 1 | 1 | 6 March 2009 | 6 March 2009 |
| Atomstream Limited | 1 | 1 | 23 April 2010 | 23 April 2010 |
| Barritel Limited | 1 | 1 | 7 June 2007 | 7 June 2007 |
| Belgacom International Carrier Services SA | 1 | 1 | 3 February 2020 | 3 February 2020 |
| Bicom Systems EURL | 1 | 1 | 2 March 2012 | 2 March 2012 |
| Bink Networks Ltd | 1 | 1 | 3 April 2023 | 3 April 2023 |
| CFL Communications Ltd | 1 | 1 | 10 July 2009 | 10 July 2009 |
| Colt Technology Services | 1 | 1 | 22 April 2015 | 22 April 2015 |
| Content Guru Limited | 1 | 1 | 15 October 2012 | 15 October 2012 |
| DIDWW Ireland Limited | 1 | 1 | 18 January 2019 | 18 January 2019 |
| Dial 9 Communications Limited | 1 | 1 | 10 December 2019 | 10 December 2019 |
| Digitech Solutions Global Limited | 1 | 1 | 28 April 2010 | 28 April 2010 |
| EVE CONNECT LTD | 1 | 1 | 15 June 2022 | 15 June 2022 |
| Flextel Limited | 1 | 1 | 17 November 2005 | 17 November 2005 |
| Gamma Telecom Holdings Limited | 1 | 1 | 18 April 2005 | 18 April 2005 |
| Hello Telecom (UK) Limited | 1 | 1 | 20 July 2012 | 20 July 2012 |
Showing the 30 largest of 78 holders.
All number blocks on 01433first 200 of 460, by prefix
| Prefix | Status | Range holder |
|---|---|---|
| +44 143300 | Protected | — |
| +44 143301 | Protected | — |
| +44 143302 | Protected | — |
| +44 143303 | Protected | — |
| +44 143304 | Protected | — |
| +44 143305 | Protected | — |
| +44 143306 | Protected | — |
| +44 143307 | Protected | — |
| +44 143308 | Protected | — |
| +44 143309 | Protected | — |
| +44 143310 | Protected | — |
| +44 143311 | Protected | — |
| +44 143312 | Protected | — |
| +44 143313 | Protected | — |
| +44 143314 | Protected | — |
| +44 143315 | Protected | — |
| +44 143316 | Protected | — |
| +44 143317 | Protected | — |
| +44 143318 | Protected | — |
| +44 143319 | Protected | — |
| +44 1433200 | Protected | — |
| +44 1433201 | Protected | — |
| +44 1433202 | Protected | — |
| +44 1433203 | Protected | — |
| +44 1433204 | Protected | — |
| +44 1433205 | Protected | — |
| +44 1433206 | Protected | — |
| +44 1433207 | Protected | — |
| +44 1433208 | Allocated | TalkTalk Communications Limited |
| +44 1433209 | Allocated | TalkTalk Communications Limited |
| +44 143321 | Allocated | Voiceflex Limited |
| +44 143322 | Protected | — |
| +44 143323 | Allocated | Nationwide Telephone Assistance Ltd |
| +44 143324 | Allocated | (AQ) LIMITED |
| +44 143325 | Allocated | VoIP-Un Limited |
| +44 143326 | Allocated | Digital Space Group Limited |
| +44 1433270 | Protected | — |
| +44 1433271 | Protected | — |
| +44 1433272 | Protected | — |
| +44 1433273 | Protected | — |
| +44 1433274 | Protected | — |
| +44 1433275 | Protected | — |
| +44 1433276 | Protected | — |
| +44 1433277 | Allocated | Digital Space Group Limited |
| +44 1433278 | Protected | — |
| +44 1433279 | Protected | — |
| +44 143328 | Allocated | Telecom2 Limited |
| +44 143329 | Allocated | Nodemax Limited |
| +44 143330 | Protected | — |
| +44 143331 | Allocated | Served Up Limited |
| +44 1433320 | Protected | — |
| +44 1433321 | Allocated | Internexus Networks Limited |
| +44 1433322 | Allocated | Orbtalk Limited |
| +44 1433323 | Allocated | Simwood eSMS Limited |
| +44 1433324 | Protected | — |
| +44 1433325 | Allocated | Bicom Systems EURL |
| +44 1433326 | Allocated | 8x8 Communications UK Limited |
| +44 1433327 | Allocated | ICC Networks Ltd |
| +44 1433328 | Allocated | IOVOX Limited |
| +44 1433329 | Allocated | Ziron Limited |
| +44 1433330 | Protected | — |
| +44 1433331 | Protected | — |
| +44 1433332 | Protected | — |
| +44 1433333 | Allocated | VoiceHost Limited |
| +44 1433334 | Protected | — |
| +44 1433335 | Protected | — |
| +44 1433336 | Protected | — |
| +44 1433337 | Protected | — |
| +44 1433338 | Protected | — |
| +44 1433339 | Protected | — |
| +44 1433340 | Protected | — |
| +44 1433341 | Protected | — |
| +44 1433342 | Protected | — |
| +44 1433343 | Protected | — |
| +44 1433344 | Protected | — |
| +44 1433345 | Protected | — |
| +44 1433346 | Protected | — |
| +44 1433347 | Protected | — |
| +44 1433348 | Protected | — |
| +44 1433349 | Protected | — |
| +44 143335 | Allocated | TTNC Limited |
| +44 143336 | Protected | — |
| +44 1433370 | Protected | — |
| +44 1433371 | Protected | — |
| +44 1433372 | Protected | — |
| +44 1433373 | Protected | — |
| +44 1433374 | Protected | — |
| +44 1433375 | Protected | — |
| +44 1433376 | Protected | — |
| +44 1433377 | Allocated | Spitfire Network Services Limited |
| +44 1433378 | Protected | — |
| +44 1433379 | Protected | — |
| +44 1433380 | Protected | — |
| +44 1433381 | Protected | — |
| +44 1433382 | Protected | — |
| +44 1433383 | Protected | — |
| +44 1433384 | Protected | — |
| +44 1433385 | Protected | — |
| +44 1433386 | Protected | — |
| +44 1433387 | Protected | — |
| +44 1433388 | Protected | — |
| +44 1433389 | Protected | — |
| +44 143339 | Allocated | TelNG Limited |
| +44 1433400 | Allocated | Linear Telecoms Limited |
| +44 1433401 | Protected | — |
| +44 1433402 | Protected | — |
| +44 1433403 | Protected | — |
| +44 1433404 | Protected | — |
| +44 1433405 | Protected | — |
| +44 1433406 | Protected | — |
| +44 1433407 | Protected | — |
| +44 1433408 | Protected | — |
| +44 1433409 | Protected | — |
| +44 1433410 | Allocated | Sky UK Limited |
| +44 1433411 | Allocated | Redwood Technologies Ltd |
| +44 1433412 | Protected | — |
| +44 1433413 | Allocated | Adepteo Limited |
| +44 1433414 | Allocated | GCI Network Solutions Limited |
| +44 1433415 | Allocated | I.T Communications Limited |
| +44 1433416 | Allocated | Colt Technology Services |
| +44 1433417 | Allocated | Zapappi Ltd |
| +44 1433418 | Allocated | IP Voice Networks Ltd |
| +44 1433419 | Allocated | M247 Ltd |
| +44 143342 | Allocated | AQL Wholesale Ltd |
| +44 143343 | Protected | — |
| +44 143344 | Allocated | Gamma Telecom Holdings Limited |
| +44 1433450 | Protected | — |
| +44 1433451 | Protected | — |
| +44 1433452 | Protected | — |
| +44 1433453 | Protected | — |
| +44 1433454 | Protected | — |
| +44 1433455 | Protected | — |
| +44 1433456 | Protected | — |
| +44 1433457 | Protected | — |
| +44 1433458 | Protected | — |
| +44 1433459 | Protected | — |
| +44 143346 | Allocated | Localphone Limited |
| +44 1433470 | Allocated | Six Degrees Technology Group Limited |
| +44 1433471 | Protected | — |
| +44 1433472 | Protected | — |
| +44 1433473 | Allocated | Six Degrees Technology Group Limited |
| +44 1433474 | Allocated | Six Degrees Technology Group Limited |
| +44 1433475 | Protected | — |
| +44 1433476 | Protected | — |
| +44 1433477 | Protected | — |
| +44 1433478 | Protected | — |
| +44 1433479 | Protected | — |
| +44 143348 | Allocated | Barritel Limited |
| +44 143349 | Allocated | Flextel Limited |
| +44 143350 | Allocated | Net-Work Internet Ltd |
| +44 143351 | Protected | — |
| +44 1433520 | Allocated | Voxbone SA |
| +44 1433521 | Protected | — |
| +44 1433522 | Protected | — |
| +44 1433523 | Protected | — |
| +44 1433524 | Protected | — |
| +44 1433525 | Protected | — |
| +44 1433526 | Protected | — |
| +44 1433527 | Protected | — |
| +44 1433528 | Protected | — |
| +44 1433529 | Protected | — |
| +44 143353 | Allocated | Solutios Limited |
| +44 1433540 | Allocated | GCI Network Solutions Limited |
| +44 1433541 | Allocated | GCI Network Solutions Limited |
| +44 1433542 | Allocated | GCI Network Solutions Limited |
| +44 1433543 | Allocated | GCI Network Solutions Limited |
| +44 1433544 | Allocated | GCI Network Solutions Limited |
| +44 1433545 | Allocated | GCI Network Solutions Limited |
| +44 1433546 | Allocated | GCI Network Solutions Limited |
| +44 1433547 | Allocated | GCI Network Solutions Limited |
| +44 1433548 | Allocated | GCI Network Solutions Limited |
| +44 1433549 | Allocated | GCI Network Solutions Limited |
| +44 143355 | Allocated | Simwood eSMS Limited |
| +44 143356 | Allocated | Mars Communications Limited |
| +44 143357 | Allocated | Andrews & Arnold (Numbers) Ltd |
| +44 143358 | Allocated | Invade International Ltd |
| +44 143359 | Allocated | Nexus Telecommunications Limited |
| +44 143360 | Allocated | Vodafone Ltd (C&W) |
| +44 143361 | Allocated | Redcentric Solutions Limited |
| +44 143362 | Allocated | BT |
| +44 143363 | Allocated | BT |
| +44 143364 | Allocated | Vodafone Ltd (C&W) |
| +44 143365 | Allocated | BT |
| +44 1433660 | Protected | — |
| +44 1433661 | Protected | — |
| +44 1433662 | Protected | — |
| +44 1433663 | Protected | — |
| +44 1433664 | Protected | — |
| +44 1433665 | Protected | — |
| +44 1433666 | Protected | — |
| +44 1433667 | Protected | — |
| +44 1433668 | Protected | — |
| +44 1433669 | Allocated | Vodafone Ltd (C&W) |
| +44 143367 | Allocated | BT |
| +44 143368 | Protected | — |
| +44 143369 | Allocated | Magrathea Telecommunications Limited |
| +44 143370 | Quarantined | — |
| +44 143371 | Allocated | CFL Communications Ltd |
| +44 143372 | Protected | — |
| +44 1433730 | Allocated | Inet Telecoms Ltd (Voipfone) |
Related lookups
- 01246 Chesterfield18 km away
- 01298 Buxton19 km away
- 01629 Matlock22 km away
- 01457 Glossop23 km away
- GCI Network Solutions Limited11 allocated blocks on 01433
- BT4 allocated blocks on 01433
- Inet Telecoms Ltd (Voipfone)4 allocated blocks on 01433
- All UK towns A–ZDialling codes by town
- More Derbyshire 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 01433
Where is area code 01433?
01433 is Ofcom's Hathersage numbering area, in Derbyshire, East Midlands England. Its exchange town is in Derbyshire. From abroad, drop the 0 and dial +44 1433.
Do I need to dial 01433 for a local call?
Traditionally not from another 01433 landline, but it now depends on your provider: Ofcom stopped requiring providers to offer local (code-free) dialling on 11 March 2022. Dialling 01433 first always works, and mobiles always need it.
How are 01433 numbers written?
Numbers on 01433 use Ofcom's 4+6 format: the 5-digit code (including the leading 0) followed by a 6-digit local number — written like 01433 234 567. From abroad the leading zero is dropped: +44 1433 then the local number.
What was the 01433 area code before?
01433 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 0433. Old signage or stationery showing 0433 refers to the same Hathersage numbers.
Which phone companies hold 01433 numbers?
Ofcom lists 78 providers with allocated blocks on 01433. The largest are GCI Network Solutions Limited with 11 of the 102 allocated blocks, BT with 4 of the 102 allocated blocks and Inet Telecoms Ltd (Voipfone) with 4 of the 102 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 01433?
By distance between exchange towns, the nearest other codes are 01246 Chesterfield (18 km), 01298 Buxton (19 km), 01629 Matlock (22 km) and 01457 Glossop (23 km).
How do I report a scam call from a 01433 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.