023 Area Code — Southampton / Portsmouth, UK

023 is the UK dialling code for Southampton / Portsmouth, allocated by Ofcom under the National Telephone Numbering Plan. Our database has tracked 143 distinct 023 numbers across 205 public lookups.

Quick facts

Top searched 023 numbers

These are the 023 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.

Operators serving Southampton / Portsmouth

These UK communications providers have been allocated 023 number blocks by Ofcom. The number of blocks per operator gives a rough sense of how widely each provider serves this area.

Looking up a specific 023 number?

If you have the full 10- or 11-digit number, use our free UK Phone Number Checker to see the Ofcom range holder, risk level, and any community reports for that specific number.