Range holder · Clacton-on-Sea

Mainstream Digital Ltd in Clacton-on-Sea

01255 numbering ranges allocated by Ofcom

About Mainstream Digital Ltd’s Clacton-on-Sea allocation

When Mainstream Digital Ltd is the range holder for +44 1255 it means Ofcom recorded Mainstream Digital Ltd as the provider entitled to issue numbers from these blocks when they were first allocated under the UK National Telephone Numbering Plan. 1 Clacton-on-Sea-facing block sits against Mainstream Digital Ltd in the current Ofcom snapshot, each of which can carry up to ten thousand individual digits available for assignment to end customers.

Clacton-on-Sea’s Essex telecoms estate is shaped by Clacton-on-Sea's residential and business catchment: a dense urban exchange typically hosts allocations from several national operators in parallel, which is why you see Mainstream Digital Ltd’s blocks alongside other range holders on the same 01255 code. Local switching capacity, historic Openreach exchange footprints, and Mainstream Digital Ltd’s wholesale routing arrangements all influence which blocks land in Clacton-on-Sea rather than elsewhere on the national plan.

Treat this allocation as a starting point, not a verdict on any specific caller. UK numbers are portable, so the current carrier on a given 01255 digit string may differ from the range holder shown — read Range Holder vs current provider for the distinction, and How Ofcom allocates UK phone numbers for the wider context behind the table below.

Mainstream Digital Ltd on 01255: by the numbers

Clacton-on-Sea blocks: 1
In active service: 100%
Share of 01255: 0%
Holders on code: 103

Of the 1 block Mainstream Digital Ltd runs on the 01255 code, 1 (100%) is marked as actively allocated in the current Ofcom snapshot.

By number family these blocks are 100% geographic (01 / 02) — a profile that tells you what kind of caller a Clacton-on-Sea Mainstream Digital Ltd number is likely to be before you even dial it back.

Mainstream Digital Ltd runs 1 of the 822 allocated blocks on the 01255 dialling code — roughly 0% of Clacton-on-Sea’s mapped allocation, shared with 102 other range holders. Most are listed as "Allocated", which means the block is currently in active service with a communications provider.

Allocated ranges

Mainstream Digital Ltd blocks on the 01255 (Clacton-on-Sea) dialling code.

Prefix	Status
+44 12555	Allocated

Quick links

FAQs about Mainstream Digital Ltd on 01255

Why does Mainstream Digital Ltd appear on Clacton-on-Sea (01255) numbers?

Mainstream Digital Ltd is listed in Ofcom's UK Numbering Data feed as the originally-allocated range holder for 1 number block on the 01255 dialling code, which covers Clacton-on-Sea. That allocation pre-dates any individual customer — it simply means Ofcom recognised Mainstream Digital Ltd as the wholesale operator entitled to issue those digits when the block was first allocated.

Are calls from a Clacton-on-Sea Mainstream Digital Ltd-allocated number safe?

An Ofcom allocation only tells you which provider the block was issued to; it is not a safety verdict. UK numbers can be ported between networks, and any UK area code can be spoofed by an overseas caller. Paste the specific 01255 number into the lookup above to combine the Mainstream Digital Ltd range data with a live AI internet check for forum reports, scam databases, and business listings.

Has Mainstream Digital Ltd's 01255 block been updated recently?

Yes — the table above is sourced from Ofcom's public UK Numbering Data feed, which we re-ingest every week (typically Wednesday). Any block that has been re-assigned, withdrawn or marked free will appear with its new status on the next refresh. Numbers within an allocated block can still be ported to another carrier in between Ofcom updates; see our range-holder-vs-current-provider guide for the distinction.