- Prefix
01923 9- Area
- Watford
- Number type
- Geographic landline (01/02)
- Format
01923 9XXXXX- From abroad
+44 1923 9XXXXX- Ofcom blocks in range
- 91
- Blocks in service
- 85
- Range holders
- 43
What are 01923 9XXXXX numbers?
Any UK number matching 01923 9XXXXX sits in the
01923 dialling code for Watford.
Ofcom hands these numbers to communications providers in blocks; this range
contains 91 blocks, of which
85 are allocated and usable. Calls from these
numbers are typically homes and businesses in the Watford area — or
organisations elsewhere that keep a local 01923 presence using
VoIP.
Who holds 01923 9… number ranges?
| Range holder (allocated by Ofcom) | Number blocks | Example range |
|---|---|---|
| Gamma Telecom Holdings Limited | 17 | 01923 910XXX |
| BT | 10 | 01923 918XXX |
| Sky UK Limited | 7 | 01923 904XXX |
| Colt Technology Services | 6 | 01923 913XXX |
| Voxbone SA | 3 | 01923 968XXX |
| Adepteo Limited | 2 | 01923 925XXX |
| Fuse 2 Communications Ltd | 2 | 01923 905XXX |
| Hyperoptic Ltd | 2 | 01923 924XXX |
| TalkTalk Communications Limited | 2 | 01923 903XXX |
| AQL Wholesale Ltd | 1 | 01923 977XXX |
| Antheus Telecom Limited | 1 | 01923 938XXX |
| Belgacom International Carrier Services SA | 1 | 01923 921XXX |
…and 31 more providers hold smaller allocations in this range.
Ofcom’s data shows the provider each number range was originally allocated to — not who holds an individual number today. Numbers are frequently moved (ported) between providers, and no public database reveals the person or business behind a specific number, so treat any service that claims to with suspicion.
Not every block in this range is in service: of the 91 blocks Ofcom lists, 4 are protected (reserved by Ofcom and not in use) and 2 are free/unallocated. A call appearing to come from an unallocated block is a strong sign of a spoofed number.
Is a call from a 01923 9… number safe?
A local-looking number is never proof of who is calling: fraudsters spoof 01923 caller IDs so their calls look like they come from Watford (‘neighbour spoofing’). If an unexpected caller asks for personal, banking or one-time-code details, hang up and ring the organisation back on a number you find independently. To put a name to a caller, see who called me?; to report one, see how to report a scam number.
Check a specific 01923 9XXXXX number
Paste any full number into the checker above (or on the main phone number checker) to see its exact range holder and allocation status from this week’s Ofcom data.
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