- Prefix
01535 5- Area
- Keighley
- Number type
- Geographic landline (01/02)
- Format
01535 5XXXXX- From abroad
+44 1535 5XXXXX- Ofcom blocks in range
- 100
- Blocks in service
- 41
- Range holders
- 37
What are 01535 5XXXXX numbers?
Any UK number matching 01535 5XXXXX sits in the
01535 dialling code for Keighley.
Ofcom hands these numbers to communications providers in blocks; this range
contains 100 blocks, of which
41 are allocated and usable. Calls from these
numbers are typically homes and businesses in the Keighley area — or
organisations elsewhere that keep a local 01535 presence using
VoIP.
Who holds 01535 5… number ranges?
| Range holder (allocated by Ofcom) | Number blocks | Example range |
|---|---|---|
| Sky UK Limited | 5 | 01535 500XXX |
| Alnitak GmbH | 1 | 01535 537XXX |
| Andrews & Arnold (Numbers) Ltd | 1 | 01535 501XXX |
| Atomstream Limited | 1 | 01535 511XXX |
| Belgacom International Carrier Services SA | 1 | 01535 558XXX |
| Bink Networks Ltd | 1 | 01535 520XXX |
| Buzz Networks Limited | 1 | 01535 509XXX |
| CFL Communications Ltd | 1 | 01535 504XXX |
| Calltracks Limited | 1 | 01535 513XXX |
| Colt Technology Services | 1 | 01535 536XXX |
| DIDWW Ireland Limited | 1 | 01535 553XXX |
| Datazero Ltd | 1 | 01535 514XXX |
…and 25 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 100 blocks Ofcom lists, 49 are protected (reserved by Ofcom and not in use) and 10 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 01535 5… number safe?
A local-looking number is never proof of who is calling: fraudsters spoof 01535 caller IDs so their calls look like they come from Keighley (‘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 01535 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.
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