UK area code
01923 — Watford
The 01923 dialling code covers Watford in Hertfordshire. Below are the currently-allocated Ofcom number ranges and the Range Holders they are assigned to.
About the 01923 dialling code
01923 is the UK area code for Watford and the surrounding Hertfordshire area, listed in Ofcom’s National Telephone Numbering Plan. When a UK landline calls you and the number begins +44 1923 the originating exchange is most likely physically located in or near Watford. 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 01923 can differ from the Range Holder shown — see Range Holder vs current provider for the full explanation.
To identify a specific 01923 number, paste it into the lookup form above. You will see the Range Holder, the allocation status, the area-code metadata for Watford, and a live AI internet check summarising any public web reports about that exact number — useful when an unfamiliar 01923 caller turns out to be a legitimate local business, a national contact-centre, or a scam.
Range holders on 01923
No Range Holder data is currently loaded for this code. Run the weekly Ofcom ingest to populate.
All allocated ranges on 01923
Showing up to 200 ranges, ordered by prefix.
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Related lookups
FAQs about 01923
What does the 01923 area code cover?
01923 is the UK dialling code for Watford and the wider Hertfordshire area. When you receive a call starting with 01923 from a UK landline, the originating exchange is likely in or near Watford.
Is a 01923 number safe?
Most calls from 01923 are legitimate landlines. Scammers can however spoof any UK area code, so a 01923 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 01923 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.