Number range
01245 25xxxx
Ofcom’s records for the block of 10,000 numbers that start 0124525, and any numbers in it that we hold other information about.
What Ofcom’s records say
- Allocated to
- BT
- The provider Ofcom gave the block to
- Ofcom status
- Allocated
- Allocated on
- 15 July 1994
- Numbers in block
- 10,000 numbers
- Number length
- 11 digits
Source: Ofcom numbering data, files published 7 October 2026, checked 13 October 2026
Ofcom has allocated this block of numbers to BT.
Ofcom allocates phone numbers to communications providers in blocks. The provider shown is the one Ofcom allocated this block to. It is not the person or business that called you, and the number may since have moved to a different network, because people can usually keep their number when they switch provider. Ofcom does not hold information about individual numbers.
Numbers in this range we know about
Numbers an organisation lists on its own website or in an official register, and numbers at least 3 visitors have reported.
- 01245 250021
- School: Mildmay Primary School
- 01245 250781
- School: Perryfields Junior School
- 01245 251700
- School: Westlands Community Primary School
- 01245 256030
- School: St John Payne Catholic School, Chelmsford
- 01245 256074
- School: Kings Road Primary School
- 01245 258252
- Pharmacy: Boots
- 01245 258484
- Pharmacy: Day Lewis Pharmacy
- 01245 258583
- Pharmacy: Galleywood Pharmacy Ltd
- 01245 259403
- School: Meadgate Primary School
Contains public sector information from Department for Education, "Establishment fields CSV" (13 October 2026), licensed under the Open Government Licence v3.0.
Contains public sector information from NHS England (Organisation Data Service), "Pharmacies (edispensary)" (13 October 2026), licensed under the Open Government Licence v3.0.
Sources and checks
This page relies on:
Checked on 13 October 2026. Read how reports work. How we check our information. Spotted a mistake? Tell us and we will put it right.