UK area code
01491 area code — Henley-on-Thames
01491 is Ofcom’s Henley-on-Thames numbering area, in Oxfordshire, South East England. 95 phone companies hold its 145 allocated number blocks. Its numbers are written like 01491 234 567. The nearest other codes are 0118 Reading (10 km) and 01628 Maidenhead (13 km).
01491 at a glance
- Ofcom area name
- Henley-on-Thames
- County
- Oxfordshire
- Council area
- Oxfordshire
- Region
- South East England
- Number format
- 01491 234 567 (4+6)
- Local calls
- Full number recommended
- Current code since
- 1995 (previously 0491)
- Allocated blocks
- 145 of 415 (35%) across 95 providers
- Newest block
- 30 June 2026 (2 in the last 12 months)
Sources: Ofcom numbering data (weekly) and area-code list, Ofcom Numbering Plan, ONS geography.
If a 01491 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.
01491 history and number format
Number format: Numbers on 01491 use Ofcom's 4+6 format: the 5-digit code (including the leading 0) followed by a 6-digit local number — written like 01491 234 567.
Before 1995: 01491 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 0491.
Local dialling: Traditionally not from another 01491 landline, but it now depends on your provider: Ofcom stopped requiring providers to offer local (code-free) dialling on 11 March 2022. Dialling 01491 first always works, and mobiles always need it.
Allocation record: the oldest number block still visible on 01491 was allocated on 15 July 1994, and the most recent on 30 June 2026. 2 blocks were allocated in the last 12 months — newly-activated ranges with no call history, which is worth knowing when an unfamiliar 01491 number rings (see the weekly numbering changelog for every new allocation.)
Phone companies holding 01491 numbers
Every Ofcom range holder with blocks on 01491, 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 | 17 | 17 | 15 July 1994 | 20 March 2024 |
| GCI Network Solutions Limited | 12 | 12 | 2 May 2017 | 26 February 2024 |
| Virgin Media Limited | 6 | 6 | 18 May 1995 | 29 June 2012 |
| Vodafone Ltd (C&W) | 6 | 6 | 4 September 2013 | 16 November 2021 |
| GTT-EMEA LTD | 4 | 4 | 13 October 2021 | 13 October 2021 |
| Resilient Limited | 3 | 3 | 18 May 2012 | 18 May 2012 |
| TalkTalk Communications Limited | 3 | 3 | 19 January 2012 | 12 February 2013 |
| Colt Technology Services | 2 | 2 | 30 January 2013 | 13 August 2018 |
| Digital Space Group Limited | 2 | 2 | 28 April 2008 | 15 March 2016 |
| Fuse 2 Communications Ltd | 2 | 2 | 4 July 2017 | 22 January 2024 |
| Gamma Telecom Holdings Limited | 2 | 2 | 4 March 2005 | 30 June 2026 |
| Served Up Limited | 2 | 2 | 27 May 2008 | 3 June 2008 |
| VoiceHost Limited | 2 | 2 | 22 June 2010 | 30 June 2010 |
| (AQ) LIMITED | 1 | 1 | 11 September 2012 | 11 September 2012 |
| 8x8 Communications UK Limited | 1 | 1 | 30 March 2012 | 30 March 2012 |
| AQL Wholesale Ltd | 1 | 1 | 4 January 2008 | 4 January 2008 |
| Adepteo Limited | 1 | 1 | 17 January 2017 | 17 January 2017 |
| Andrews & Arnold (Numbers) Ltd | 1 | 1 | 11 March 2009 | 11 March 2009 |
| Andrews & Arnold Ltd | 1 | 1 | 13 April 2007 | 13 April 2007 |
| Atomstream Limited | 1 | 1 | 23 March 2010 | 23 March 2010 |
| Barritel Limited | 1 | 1 | 22 November 2006 | 22 November 2006 |
| 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 |
| Buzz Networks Limited | 1 | 1 | 4 March 2010 | 4 March 2010 |
| CFL Communications Ltd | 1 | 1 | 13 July 2009 | 13 July 2009 |
| Calltracks Limited | 1 | 1 | 23 September 2013 | 23 September 2013 |
| Content Guru Limited | 1 | 1 | 12 October 2012 | 12 October 2012 |
| Core Telecom Limited | 1 | 1 | 5 August 2010 | 5 August 2010 |
| DIDWW Ireland Limited | 1 | 1 | 27 January 2020 | 27 January 2020 |
Showing the 30 largest of 95 holders.
All number blocks on 01491first 200 of 415, by prefix
| Prefix | Status | Range holder |
|---|---|---|
| +44 149100 | Protected | — |
| +44 149101 | Protected | — |
| +44 149102 | Protected | — |
| +44 149103 | Protected | — |
| +44 149104 | Protected | — |
| +44 149105 | Protected | — |
| +44 149106 | Protected | — |
| +44 149107 | Protected | — |
| +44 149108 | Protected | — |
| +44 149109 | Protected | — |
| +44 149110 | Protected | — |
| +44 149111 | Protected | — |
| +44 149112 | Protected | — |
| +44 149113 | Protected | — |
| +44 149114 | Protected | — |
| +44 149115 | Protected | — |
| +44 149116 | Protected | — |
| +44 149117 | Protected | — |
| +44 149118 | Protected | — |
| +44 149119 | Protected | — |
| +44 149120 | Allocated | Virgin Media Limited |
| +44 149121 | Allocated | Served Up Limited |
| +44 1491220 | Allocated | VoiceHost Limited |
| +44 1491221 | Allocated | Windsor Telecom Limited |
| +44 1491222 | Allocated | VoiceHost Limited |
| +44 1491223 | Allocated | Core Telecom Limited |
| +44 1491224 | Protected | — |
| +44 1491225 | Allocated | Invoco Ltd |
| +44 1491226 | Allocated | Hello Telecom (UK) Limited |
| +44 1491227 | Allocated | Internexus Networks Limited |
| +44 1491228 | Allocated | Tuxtel Ltd |
| +44 1491229 | Protected | — |
| +44 1491230 | Protected | — |
| +44 1491231 | Protected | — |
| +44 1491232 | Protected | — |
| +44 1491233 | Protected | — |
| +44 1491234 | Protected | — |
| +44 1491235 | Protected | — |
| +44 1491236 | Protected | — |
| +44 1491237 | Protected | — |
| +44 1491238 | Protected | — |
| +44 1491239 | Protected | — |
| +44 1491240 | Protected | — |
| +44 1491241 | Protected | — |
| +44 1491242 | Protected | — |
| +44 1491243 | Protected | — |
| +44 1491244 | Allocated | Digital Mail Limited |
| +44 1491245 | Protected | — |
| +44 1491246 | Protected | — |
| +44 1491247 | Protected | — |
| +44 1491248 | Protected | — |
| +44 1491249 | Protected | — |
| +44 1491250 | Protected | — |
| +44 1491251 | Protected | — |
| +44 1491252 | Protected | — |
| +44 1491253 | Protected | — |
| +44 1491254 | Protected | — |
| +44 1491255 | Protected | — |
| +44 1491256 | Protected | — |
| +44 1491257 | Protected | — |
| +44 1491258 | Protected | — |
| +44 1491259 | Protected | — |
| +44 149126 | Allocated | TTNC Limited |
| +44 149127 | Allocated | TGL Services (UK) Ltd |
| +44 149128 | Allocated | Sky UK Limited |
| +44 1491290 | Protected | — |
| +44 1491291 | Protected | — |
| +44 1491292 | Protected | — |
| +44 1491293 | Protected | — |
| +44 1491294 | Protected | — |
| +44 1491295 | Protected | — |
| +44 1491296 | Protected | — |
| +44 1491297 | Protected | — |
| +44 1491298 | Protected | — |
| +44 1491299 | Protected | — |
| +44 149130 | Allocated | Redcentric Solutions Limited |
| +44 149131 | Allocated | Voiceflex Limited |
| +44 149132 | Allocated | (AQ) LIMITED |
| +44 149133 | Protected | — |
| +44 149134 | Allocated | VoIP-Un Limited |
| +44 149135 | Allocated | AQL Wholesale Ltd |
| +44 1491360 | Protected | — |
| +44 1491361 | Protected | — |
| +44 1491362 | Protected | — |
| +44 1491363 | Protected | — |
| +44 1491364 | Protected | — |
| +44 1491365 | Protected | — |
| +44 1491366 | Protected | — |
| +44 1491367 | Allocated | Digital Space Group Limited |
| +44 1491368 | Protected | — |
| +44 1491369 | Protected | — |
| +44 1491370 | Allocated | Nodemax Limited |
| +44 1491371 | Allocated | TalkTalk Communications Limited |
| +44 1491372 | Protected | — |
| +44 1491373 | Protected | — |
| +44 1491374 | Allocated | Lumen Technologies UK Limited |
| +44 1491375 | Allocated | Solutios Limited |
| +44 1491376 | Allocated | Telecom2 Limited |
| +44 1491377 | Allocated | Net-Work Internet Ltd |
| +44 1491378 | Allocated | Voxbone SA |
| +44 1491379 | Quarantined | — |
| +44 149138 | Allocated | Digital Space Group Limited |
| +44 149139 | Allocated | Nationwide Telephone Assistance Ltd |
| +44 149140 | Allocated | Served Up Limited |
| +44 149141 | Allocated | BT |
| +44 149142 | Allocated | Barritel Limited |
| +44 149143 | Allocated | TelNG Limited |
| +44 149144 | Protected | — |
| +44 1491450 | Allocated | GCI Network Solutions Limited |
| +44 1491451 | Allocated | GCI Network Solutions Limited |
| +44 1491452 | Allocated | GCI Network Solutions Limited |
| +44 1491453 | Allocated | GCI Network Solutions Limited |
| +44 1491454 | Allocated | GCI Network Solutions Limited |
| +44 1491455 | Allocated | GCI Network Solutions Limited |
| +44 1491456 | Allocated | GCI Network Solutions Limited |
| +44 1491457 | Allocated | GCI Network Solutions Limited |
| +44 1491458 | Allocated | GCI Network Solutions Limited |
| +44 1491459 | Allocated | GCI Network Solutions Limited |
| +44 149146 | Allocated | Verizon UK Limited |
| +44 149147 | Allocated | Localphone Limited |
| +44 1491480 | Protected | — |
| +44 1491481 | Protected | — |
| +44 1491482 | Protected | — |
| +44 1491483 | Protected | — |
| +44 1491484 | Protected | — |
| +44 1491485 | Protected | — |
| +44 1491486 | Protected | — |
| +44 1491487 | Allocated | Spitfire Network Services Limited |
| +44 1491488 | Protected | — |
| +44 1491489 | Protected | — |
| +44 1491490 | Allocated | Resilient Limited |
| +44 1491491 | Allocated | Resilient Limited |
| +44 1491492 | Protected | — |
| +44 1491493 | Protected | — |
| +44 1491494 | Protected | — |
| +44 1491495 | Protected | — |
| +44 1491496 | Protected | — |
| +44 1491497 | Protected | — |
| +44 1491498 | Protected | — |
| +44 1491499 | Allocated | Resilient Limited |
| +44 149150 | Allocated | Vodafone Ltd (C&W) |
| +44 1491510 | Protected | — |
| +44 1491511 | Protected | — |
| +44 1491512 | Protected | — |
| +44 1491513 | Protected | — |
| +44 1491514 | Protected | — |
| +44 1491515 | Protected | — |
| +44 1491516 | Protected | — |
| +44 1491517 | Protected | — |
| +44 1491518 | Protected | — |
| +44 1491519 | Protected | — |
| +44 149152 | Allocated | Gamma Telecom Holdings Limited |
| +44 149153 | Protected | — |
| +44 149154 | Allocated | GCI Network Solutions Limited |
| +44 149155 | Allocated | Vodafone Ltd (C&W) |
| +44 1491560 | Allocated | GTT-EMEA LTD |
| +44 1491561 | Protected | — |
| +44 1491562 | Protected | — |
| +44 1491563 | Protected | — |
| +44 1491564 | Protected | — |
| +44 1491565 | Protected | — |
| +44 1491566 | Allocated | GTT-EMEA LTD |
| +44 1491567 | Allocated | GTT-EMEA LTD |
| +44 1491568 | Protected | — |
| +44 1491569 | Allocated | GTT-EMEA LTD |
| +44 149157 | Allocated | BT |
| +44 149158 | Allocated | Flextel Limited |
| +44 1491590 | Protected | — |
| +44 1491591 | Protected | — |
| +44 1491592 | Protected | — |
| +44 1491593 | Protected | — |
| +44 1491594 | Protected | — |
| +44 1491595 | Protected | — |
| +44 1491596 | Protected | — |
| +44 1491597 | Protected | — |
| +44 1491598 | Allocated | TalkTalk Communications Limited |
| +44 1491599 | Allocated | TalkTalk Communications Limited |
| +44 149160 | Allocated | Vodafone Ltd (C&W) |
| +44 149161 | Allocated | BT |
| +44 149162 | Allocated | BT |
| +44 149163 | Allocated | BT |
| +44 149164 | Allocated | BT |
| +44 149165 | Allocated | BT |
| +44 149166 | Allocated | Vodafone Ltd (C&W) |
| +44 149167 | Allocated | BT |
| +44 149168 | Allocated | BT |
| +44 149169 | Allocated | Vodafone Ltd (C&W) |
| +44 1491700 | Allocated | Mars Communications Limited |
| +44 1491701 | Allocated | Datazero Ltd |
| +44 1491702 | Allocated | Invade International Ltd |
| +44 1491703 | Allocated | Telecoms World Limited |
| +44 1491704 | Protected | — |
| +44 1491705 | Allocated | Andrews & Arnold (Numbers) Ltd |
| +44 1491706 | Allocated | GCI Network Solutions Limited |
| +44 1491707 | Allocated | CFL Communications Ltd |
| +44 1491708 | Protected | — |
| +44 1491709 | Quarantined | — |
| +44 1491710 | Protected | — |
| +44 1491711 | Allocated | Nexus Telecommunications Limited |
| +44 1491712 | Allocated | Inet Telecoms Ltd (Voipfone) |
Related lookups
- 0118 Reading10 km away
- 01628 Maidenhead13 km away
- 01494 High Wycombe15 km away
- 01344 Bracknell17 km away
- BT17 allocated blocks on 01491
- GCI Network Solutions Limited12 allocated blocks on 01491
- Virgin Media Limited6 allocated blocks on 01491
- All UK towns A–ZDialling codes by town
- More Oxfordshire 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 01491
Where is area code 01491?
01491 is Ofcom's Henley-on-Thames numbering area, in Oxfordshire, South East England. Its exchange town is in Oxfordshire. From abroad, drop the 0 and dial +44 1491.
Do I need to dial 01491 for a local call?
Traditionally not from another 01491 landline, but it now depends on your provider: Ofcom stopped requiring providers to offer local (code-free) dialling on 11 March 2022. Dialling 01491 first always works, and mobiles always need it.
How are 01491 numbers written?
Numbers on 01491 use Ofcom's 4+6 format: the 5-digit code (including the leading 0) followed by a 6-digit local number — written like 01491 234 567. From abroad the leading zero is dropped: +44 1491 then the local number.
What was the 01491 area code before?
01491 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 0491. Old signage or stationery showing 0491 refers to the same Henley-on-Thames numbers.
Which phone companies hold 01491 numbers?
Ofcom lists 95 providers with allocated blocks on 01491. The largest are BT with 17 of the 145 allocated blocks, GCI Network Solutions Limited with 12 of the 145 allocated blocks and Virgin Media Limited with 6 of the 145 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 01491?
By distance between exchange towns, the nearest other codes are 0118 Reading (10 km), 01628 Maidenhead (13 km), 01494 High Wycombe (15 km) and 01344 Bracknell (17 km).
How do I report a scam call from a 01491 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.