01420 Area Code — Alton, Bordon & Four Marks
01420 is the UK dialling code for Alton in Hampshire, also serving Bordon, Four Marks and Long Sutton, allocated by Ofcom under the National Telephone Numbering Plan. Our database has tracked 233 distinct 01420 numbers across 281 public lookups.
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Quick facts
Area code
01420
Location
Alton
County
Hampshire
Region
South East England
Number type
Geographic landline
Number format
01420 XXX XXX
Operators serving
8+
Call cost
Standard rate
About the 01420 dialling code
01420 is the UK geographic dialling code for Alton, allocated by Ofcom under the National Telephone Numbering Plan. It is used by landlines — and increasingly VoIP lines — registered to the Alton area.
A full Alton number is normally written as 01420 XXXXXX. You can dial the local part on its own from within the same area, or the full number from anywhere in the UK.
Because of UK number portability and internet calling, a 01420 number no longer guarantees the caller is physically in Alton. Fraudsters also "spoof" local codes like 01420 so an unknown call looks like a nearby business or neighbour — so treat an unexpected call on what is actually said, not on the area code alone.
Map of the 01420 dialling area
The marker shows Alton; the shaded circle is an approximate indication of the area the 01420 code serves — exact Ofcom charging-area boundaries are irregular and don't follow a neat radius.
Map data © OpenStreetMap contributors. View larger map
Areas typically served by 01420
Settlements in and around the Alton dialling area that typically use 01420 numbers. Approximate — Ofcom charging-area boundaries don't follow town or county lines exactly, and properties near a boundary may take a neighbouring code.
Calling 01420 from abroad
From outside the UK, dial your international access prefix, then the UK country code 44, then 1420 (the area code without its leading zero) and the local number.
| Calling from | Dial |
|---|---|
| United States & Canada | 011 44 1420 … |
| Europe / most of the world | 00 44 1420 … |
| Australia | 0011 44 1420 … |
| Any mobile phone | +44 1420 … |
History of the 01420 code
The code was 0420 until PhONEday, 16 April 1995, when a "1" was inserted after the leading zero to create 01420.
Top searched 01420 numbers
These are the 01420 numbers most-looked-up by visitors to our number checker. Click any number to see its full lookup page with risk-level, range holder, and community reports.
| Number | Searches | Last looked up |
|---|---|---|
| 01420 480239 | 14 | 9 Jul 2026 |
| 01420 480240 | 9 | 3 Jul 2026 |
| 01420 370018 | 5 | 8 Jul 2026 |
| 01420 540040 | 4 | 5 Jul 2026 |
| 01420 356178 | 3 | 9 Jul 2026 |
| 01420 489789 | 3 | 3 Jun 2026 |
| 01420 507996 | 3 | 2 Jun 2026 |
| 01420 558050 | 2 | 8 Jul 2026 |
| 01420 610213 | 2 | 7 Jul 2026 |
| 01420 507175 | 2 | 7 Jul 2026 |
| 01420 356177 | 2 | 1 Jul 2026 |
| 01420 356182 | 2 | 1 Jul 2026 |
| 01420 487238 | 2 | 28 Jun 2026 |
| 01420 550548 | 2 | 27 Jun 2026 |
| 01420 550543 | 2 | 27 Jun 2026 |
| 01420 487233 | 2 | 27 Jun 2026 |
| 01420 544081 | 2 | 26 Jun 2026 |
| 01420 356158 | 2 | 22 Jun 2026 |
| 01420 356169 | 2 | 20 Jun 2026 |
| 01420 356164 | 2 | 9 Jun 2026 |
Is a call from 01420 safe?
Most 01420 calls are ordinary local calls from Alton homes and businesses. The main risk to be aware of is "neighbour spoofing", where a scammer fakes a local 01420 prefix so you are more likely to answer. Never share bank details, passwords or one-time security codes with an unexpected caller, even when the number looks local — hang up and call the organisation back on a number you have verified yourself.
To call a 01420 (Alton) number from outside the UK, drop the leading zero and dial +44 1420 followed by the local number.
Operators serving Alton
These UK communications providers have been allocated 01420 number blocks by Ofcom. The number of blocks per operator gives a rough sense of how widely each provider serves this area.
| Provider (Ofcom-allocated) | Allocated blocks |
|---|---|
| BT | 24 |
| Vodafone Ltd (C&W) | 9 |
| Sky UK Limited | 5 |
| TalkTalk Communications Limited | 4 |
| GCI Network Solutions Limited | 3 |
| Verizon UK Limited | 2 |
| AQL Wholesale Ltd | 2 |
| Digital Space Group Limited | 2 |
Ofcom number ranges on 01420
Ofcom's National Numbering Plan lists 397 number blocks under 01420, of which 142 are allocated to 96 communications providers. The first allocated blocks are shown below — look up any full number with the number checker to see its exact range holder.
| Number block | Status | Range holder (Ofcom-allocated) |
|---|---|---|
01420200… | Allocated | DRD Communications Limited |
0142021… | Allocated | GCI Network Solutions Limited |
0142022… | Allocated | BT |
0142023… | Allocated | BT |
01420250… | Allocated | Linear Telecoms Limited |
01420251… | Allocated | Hello Telecom (UK) Limited |
01420252… | Allocated | Internexus Networks Limited |
01420253… | Allocated | API Telecom Limited |
01420254… | Allocated | Bicom Systems EURL |
01420256… | Allocated | ICC Networks Ltd |
01420257… | Allocated | Sky UK Limited |
01420258… | Allocated | IOVOX Limited |
Showing 12 of 142 allocated blocks. Source: Ofcom telephone numbering data, updated weekly.
How to block and report 01420 spam calls
Block or report 01420
- You can block 01420 directly from your recent-calls list on iPhone or Android, and forward scam texts free to 7726.
- Scam or fraud calls should be reported to Action Fraud (0300 123 2040) or Police Scotland (101); persistent marketing calls to the ICO / TPS.
Full step-by-step instructions for every phone, network-level blocking and all UK reporting routes are in our guide: How to block and report unwanted calls in the UK.
How to stop unwanted calls for good
Blocking 01420 numbers stops that one number, but determined nuisance callers simply switch numbers. Silencing unknown callers, enabling your network's free spam shield and registering with the TPS cut the volume across the board — our canonical guide walks through each step: How to block and report unwanted calls in the UK.
Frequently asked questions about the 01420 code
Where is the 01420 area code?
The 01420 area code is allocated by Ofcom to Alton in Hampshire, United Kingdom. It is a geographic UK landline dialling code under the National Telephone Numbering Plan. The surrounding dialling area also takes in Bordon, Four Marks, Long Sutton and nearby villages.
Is 01420 always a Alton number?
Numbers with the 01420 prefix were originally allocated by Ofcom to Alton. With UK number portability and VoIP allowing geographic relocation while keeping the same number, the call origin can differ from the original area, but the prefix's official assigned location remains Alton.
How do I block 01420 spam calls?
On iPhone, tap the (i) next to the number in Recents and choose Block this Caller. On Android, long-press the number in Recents and choose Block. To prevent unknown 01420 numbers ringing, enable Settings → Phone → Silence Unknown Callers (iPhone) or your dialler's spam filter (Android). Forward spam texts to 7726 free of charge.
How much does a 01420 call cost?
Calls to UK 01420 geographic numbers are charged at your provider's standard rate and are usually included in inclusive minutes on any modern landline or mobile plan.
Neighbouring dialling codes
Codes covering areas around Alton — useful when a caller is nearby but outside the 01420 boundary.
Living in or moving to Alton?
Our free postcode reports cover house prices, crime, broadband and schools for the districts around Alton.
Check another UK number
Have the full 10- or 11-digit number? The UK Phone Number Checker shows the Ofcom range holder, risk level, and any community reports for that specific number.