- Prefix
01833 5- Area
- Barnard Castle
- Number type
- Geographic landline (01/02)
- Format
01833 5XXXXX- From abroad
+44 1833 5XXXXX- Ofcom blocks in range
- 91
- Blocks in service
- 33
- Range holders
- 32
What are 01833 5XXXXX numbers?
Any UK number matching 01833 5XXXXX sits in the
01833 dialling code for Barnard Castle.
Ofcom hands these numbers to communications providers in blocks; this range
contains 91 blocks, of which
33 are allocated and usable. Calls from these
numbers are typically homes and businesses in the Barnard Castle area — or
organisations elsewhere that keep a local 01833 presence using
VoIP.
Who holds 01833 5… number ranges?
| Range holder (allocated by Ofcom) | Number blocks | Example range |
|---|---|---|
| Fuse 2 Communications Ltd | 2 | 01833 531XXX |
| 24 Seven Cloud Communications Ltd | 1 | 01833 541XXX |
| Adepteo Limited | 1 | 01833 521XXX |
| Atomstream Limited | 1 | 01833 512XXX |
| BT | 1 | 01833 549XXX |
| Belgacom International Carrier Services SA | 1 | 01833 529XXX |
| Calltracks Limited | 1 | 01833 510XXX |
| Colt Technology Services | 1 | 01833 522XXX |
| DIDWW Ireland Limited | 1 | 01833 542XXX |
| Dial 9 Communications Limited | 1 | 01833 540XXX |
| EVE CONNECT LTD | 1 | 01833 544XXX |
| I.T Communications Limited | 1 | 01833 523XXX |
…and 20 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, 57 are protected (reserved by Ofcom and not in use) and 1 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 01833 5… number safe?
A local-looking number is never proof of who is calling: fraudsters spoof 01833 caller IDs so their calls look like they come from Barnard Castle (‘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 01833 5XXXXX 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.
Run mobiles for a business? See our business mobile network comparison or get a quote.
More 01833 number ranges
Full 01833 Barnard Castle area-code guide › · All UK area codes ›