Number range
020 3334 xxxx
Ofcom’s records for the block of 10,000 numbers that start 0203334, and any numbers in it that we hold other information about.
What Ofcom’s records say
- Allocated to
- Colt Technology Services
- The provider Ofcom gave the block to
- Ofcom status
- Allocated
- Allocated on
- 10 September 2007
- 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 Colt Technology Services.
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.
- 020 3334 3265
- Contact listed on GOV.UK: Independent Monitoring Board
- 020 3334 3536
- Government organisation: Criminal Injuries Compensation Authority
- Government organisation: Youth Custody Service
- 020 3334 3552
- Government organisation: Family Procedure Rule Committee
- 020 3334 3555
- Government organisation: Criminal Procedure Rule Committee
- Government organisation: HM Prison and Probation Service
- Government organisation: Ministry of Justice
- Government organisation: Youth Custody Service
- 020 3334 4253
- Government organisation: Legal Aid Agency
- 020 3334 4471
- Government organisation: Tribunal Procedure Committee
- 020 3334 6163
- Government organisation: Legal Aid Agency
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.