Core Telecom Limited in Northern Ireland

About Core Telecom Limited’s Northern Ireland allocation

When Core Telecom Limited is the range holder for +44 28 it means Ofcom recorded Core Telecom Limited as the provider entitled to issue numbers from these blocks when they were first allocated under the UK National Telephone Numbering Plan. 10 Northern Ireland-facing blocks sit against Core Telecom Limited in the current Ofcom snapshot, each of which can carry up to ten thousand individual digits available for assignment to end customers.

Northern Ireland’s Northern Ireland telecoms estate is shaped by Northern Ireland's catchment of roughly 1,900,000 residents: a dense urban exchange typically hosts allocations from several national operators in parallel, which is why you see Core Telecom Limited’s blocks alongside other range holders on the same 028 code. Local switching capacity, historic Openreach exchange footprints, and Core Telecom Limited’s wholesale routing arrangements all influence which blocks land in Northern Ireland 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 028 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.