IOVOX Limited in Southampton & Portsmouth

About IOVOX Limited’s Southampton & Portsmouth allocation

When IOVOX Limited is the range holder for +44 23 it means Ofcom recorded IOVOX Limited as the provider entitled to issue numbers from these blocks when they were first allocated under the UK National Telephone Numbering Plan. 12 Southampton & Portsmouth-facing blocks sit against IOVOX Limited in the current Ofcom snapshot, each of which can carry up to ten thousand individual digits available for assignment to end customers.

Southampton & Portsmouth’s South Coast telecoms estate is shaped by Southampton & Portsmouth's catchment of roughly 540,000 residents: a dense urban exchange typically hosts allocations from several national operators in parallel, which is why you see IOVOX Limited’s blocks alongside other range holders on the same 023 code. Local switching capacity, historic Openreach exchange footprints, and IOVOX Limited’s wholesale routing arrangements all influence which blocks land in Southampton & Portsmouth 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 023 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.