01255 Area Code — Clacton-on-Sea
01255 is the UK dialling code for Clacton-on-Sea in Essex, also serving Frinton-on-Sea, Walton-on-the-Naze and Little Clacton, allocated by Ofcom under the National Telephone Numbering Plan. Our database has tracked 218 distinct 01255 numbers across 237 public lookups.
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Quick facts
Area code
01255
Location
Clacton-on-Sea
County
Essex
Region
East of England
Number type
Geographic landline
Number format
01255 XXX XXX
Operators serving
8+
Call cost
Standard rate
About the 01255 dialling code
01255 is the UK geographic dialling code for Clacton-on-Sea, allocated by Ofcom under the National Telephone Numbering Plan. It is used by landlines — and increasingly VoIP lines — registered to the Clacton-on-Sea area.
A full Clacton-on-Sea number is normally written as 01255 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 01255 number no longer guarantees the caller is physically in Clacton-on-Sea. Fraudsters also "spoof" local codes like 01255 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 01255 dialling area
The marker shows Clacton-on-Sea; the shaded circle is an approximate indication of the area the 01255 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 01255
Settlements in and around the Clacton-on-Sea dialling area that typically use 01255 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 01255 from abroad
From outside the UK, dial your international access prefix, then the UK country code 44, then 1255 (the area code without its leading zero) and the local number.
| Calling from | Dial |
|---|---|
| United States & Canada | 011 44 1255 … |
| Europe / most of the world | 00 44 1255 … |
| Australia | 0011 44 1255 … |
| Any mobile phone | +44 1255 … |
History of the 01255 code
The code was 0255 until PhONEday, 16 April 1995, when a "1" was inserted after the leading zero to create 01255.
In the letter-dialling era the code had the mnemonic CL5 — on an old rotary dial, the letters CL (from Clacton-on-Sea) sat on the same holes as the digits 255, so subscribers literally dialled the start of the town's name.
Top searched 01255 numbers
These are the 01255 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 |
|---|---|---|
| 01255 686279 | 4 | 5 Jul 2026 |
| 01255 441885 | 3 | 1 Jul 2026 |
| 01255 423811 | 2 | 9 Jul 2026 |
| 01255 878827 | 2 | 6 Jul 2026 |
| 01255 207660 | 2 | 3 Jul 2026 |
| 01255 688726 | 2 | 2 Jul 2026 |
| 01255 779602 | 2 | 28 Jun 2026 |
| 01255 201699 | 2 | 27 Jun 2026 |
| 01255 242987 | 2 | 27 Jun 2026 |
| 01255 432651 | 2 | 26 Jun 2026 |
| 01255 432601 | 2 | 26 Jun 2026 |
| 01255 201552 | 2 | 25 Jun 2026 |
| 01255 235403 | 2 | 24 Jun 2026 |
| 01255 755742 | 2 | 14 Jun 2026 |
| 01255 201511 | 2 | 3 Jun 2026 |
| 01255 222444 | 2 | 29 May 2026 |
| 01255 413811 | 1 | 9 Jul 2026 |
| 01255 436704 | 1 | 9 Jul 2026 |
| 01255 235549 | 1 | 8 Jul 2026 |
| 01255 317074 | 1 | 6 Jul 2026 |
Is a call from 01255 safe?
Most 01255 calls are ordinary local calls from Clacton-on-Sea homes and businesses. The main risk to be aware of is "neighbour spoofing", where a scammer fakes a local 01255 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 01255 (Clacton-on-Sea) number from outside the UK, drop the leading zero and dial +44 1255 followed by the local number.
Operators serving Clacton-on-Sea
These UK communications providers have been allocated 01255 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 | 21 |
| Sky UK Limited | 13 |
| GCI Network Solutions Limited | 11 |
| 1XXXX | 9 |
| Vodafone Ltd (C&W) | 8 |
| TalkTalk Communications Limited | 7 |
| Virgin Media Limited | 5 |
| Digital Space Group Limited | 3 |
Ofcom number ranges on 01255
Ofcom's National Numbering Plan lists 406 number blocks under 01255, of which 168 are allocated to 102 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) |
|---|---|---|
0125520… | Allocated | BT |
01255210… | Allocated | Linear Telecoms Limited |
01255211… | Allocated | M247 Ltd |
01255212… | Allocated | Sky UK Limited |
01255214… | Allocated | Sky UK Limited |
01255216… | Allocated | I.T Communications Limited |
01255217… | Allocated | Alnitak GmbH |
01255218… | Allocated | Adepteo Limited |
0125522… | Allocated | BT |
0125523… | Allocated | BT |
0125524… | Allocated | BT |
0125525… | Allocated | BT |
Showing 12 of 168 allocated blocks. Source: Ofcom telephone numbering data, updated weekly.
How to block and report 01255 spam calls
Block or report 01255
- You can block 01255 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 01255 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 01255 code
Where is the 01255 area code?
The 01255 area code is allocated by Ofcom to Clacton-on-Sea in Essex, United Kingdom. It is a geographic UK landline dialling code under the National Telephone Numbering Plan. The surrounding dialling area also takes in Frinton-on-Sea, Walton-on-the-Naze, Little Clacton and nearby villages.
Is 01255 always a Clacton-on-Sea number?
Numbers with the 01255 prefix were originally allocated by Ofcom to Clacton-on-Sea. 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 Clacton-on-Sea.
How do I block 01255 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 01255 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 01255 call cost?
Calls to UK 01255 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 Clacton-on-Sea — useful when a caller is nearby but outside the 01255 boundary.
Living in or moving to Clacton-on-Sea?
Our free postcode reports cover house prices, crime, broadband and schools for the districts around Clacton-on-Sea.
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.