- Prefix
01245 5- Area
- Chelmsford
- Number type
- Geographic landline (01/02)
- Format
01245 5XXXXX- From abroad
+44 1245 5XXXXX- Ofcom blocks in range
- 46
- Blocks in service
- 24
- Range holders
- 11
What are 01245 5XXXXX numbers?
Any UK number matching 01245 5XXXXX sits in the
01245 dialling code for Chelmsford.
Ofcom hands these numbers to communications providers in blocks; this range
contains 46 blocks, of which
24 are allocated and usable. Calls from these
numbers are typically homes and businesses in the Chelmsford area — or
organisations elsewhere that keep a local 01245 presence using
VoIP.
Who holds 01245 5… number ranges?
| Range holder (allocated by Ofcom) | Number blocks | Example range |
|---|---|---|
| Vodafone Ltd (C&W) | 6 | 01245 524XXX |
| Lumen Technologies UK Limited | 5 | 01245 550XXX |
| BT | 3 | 01245 50XXXX |
| Six Degrees Technology Group Limited | 2 | 01245 580XXX |
| Sky UK Limited | 2 | 01245 521XXX |
| Fuse 2 Communications Ltd | 1 | 01245 522XXX |
| GCI Network Solutions Limited | 1 | 01245 57XXXX |
| Hyperoptic Ltd | 1 | 01245 530XXX |
| Invoco Ltd | 1 | 01245 527XXX |
| Kalnet4U Ltd | 1 | 01245 526XXX |
| Liquid 11 Limited | 1 | 01245 520XXX |
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 46 blocks Ofcom lists, 20 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 01245 5… number safe?
A local-looking number is never proof of who is calling: fraudsters spoof 01245 caller IDs so their calls look like they come from Chelmsford (‘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 01245 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 01245 number ranges
Full 01245 Chelmsford area-code guide › · All UK area codes ›