- Prefix
01638 4- Area
- Newmarket
- Number type
- Geographic landline (01/02)
- Format
01638 4XXXXX- From abroad
+44 1638 4XXXXX- Ofcom blocks in range
- 82
- Blocks in service
- 63
- Range holders
- 46
What are 01638 4XXXXX numbers?
Any UK number matching 01638 4XXXXX sits in the
01638 dialling code for Newmarket.
Ofcom hands these numbers to communications providers in blocks; this range
contains 82 blocks, of which
63 are allocated and usable. Calls from these
numbers are typically homes and businesses in the Newmarket area — or
organisations elsewhere that keep a local 01638 presence using
VoIP.
Who holds 01638 4… number ranges?
| Range holder (allocated by Ofcom) | Number blocks | Example range |
|---|---|---|
| GCI Network Solutions Limited | 10 | 01638 440XXX |
| Sky UK Limited | 4 | 01638 454XXX |
| TalkTalk Communications Limited | 4 | 01638 427XXX |
| BT | 2 | 01638 475XXX |
| Fuse 2 Communications Ltd | 2 | 01638 494XXX |
| Andrews & Arnold (Numbers) Ltd | 1 | 01638 450XXX |
| Atomstream Limited | 1 | 01638 462XXX |
| Bink Networks Ltd | 1 | 01638 478XXX |
| CFL Communications Ltd | 1 | 01638 456XXX |
| Calltracks Limited | 1 | 01638 463XXX |
| Colt Technology Services | 1 | 01638 492XXX |
| Convergence Group (wireless) Networks Limited | 1 | 01638 498XXX |
…and 34 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 82 blocks Ofcom lists, 19 are protected (reserved by Ofcom and not in use). A call appearing to come from an unallocated block is a strong sign of a spoofed number.
Is a call from a 01638 4… number safe?
A local-looking number is never proof of who is calling: fraudsters spoof 01638 caller IDs so their calls look like they come from Newmarket (‘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 01638 4XXXXX 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 01638 number ranges
Full 01638 Newmarket area-code guide › · All UK area codes ›