UK area code
023 — Southampton & Portsmouth
The 023 dialling code covers Southampton & Portsmouth in South Coast. Approximate population of the area: 540,000. Below are the currently-allocated Ofcom number ranges and the Range Holders they are assigned to.
About the 023 dialling code
023 is the UK area code for Southampton & Portsmouth and the surrounding South Coast area, listed in Ofcom’s National Telephone Numbering Plan. When a UK landline calls you and the number begins +44 23 the originating exchange is most likely physically located in or near Southampton & Portsmouth. Numbers in this code are allocated to UK communications providers in 1,000- or 10,000-number blocks; the table below shows which Range Holder Ofcom assigned each block to.
This is the same data Ofcom publishes every Wednesday in the public UK Numbering Data feed. We re-ingest the snapshot weekly, so the allocations you see here are at most seven days old. Because UK numbers are portable, the current carrier of any specific number on 023 can differ from the Range Holder shown — see Range Holder vs current provider for the full explanation.
To identify a specific 023 number, paste it into the lookup form above. You will see the Range Holder, the allocation status, the area-code metadata for Southampton & Portsmouth, and a live AI internet check summarising any public web reports about that exact number — useful when an unfamiliar 023 caller turns out to be a legitimate local business, a national contact-centre, or a scam.
Range holders on 023
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All allocated ranges on 023
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Related lookups
FAQs about 023
What does the 023 area code cover?
023 is the UK dialling code for Southampton & Portsmouth and the wider South Coast area. The area has a population of approximately 540,000. When you receive a call starting with 023 from a UK landline, the originating exchange is likely in or near Southampton & Portsmouth.
Is a 023 number safe?
Most calls from 023 are legitimate landlines. Scammers can however spoof any UK area code, so a 023 prefix alone doesn't guarantee safety. Use the lookup above to see the Range Holder, then read the AI internet check for behavioural reports.
How many providers operate 023 number ranges?
Across the 0 ranges currently visible, 0 different Range Holders are listed. The top allocations are typically held by Openreach (BT), Virgin Media O2 and Sky.