Details on Allocations and availability of UK Telephone Numbers may be accessed below.

(This information is updated weekly where possible).

• Geographic Numbers - issued in blocks of 10k numbers
• Geographic Numbers - issued in 1k ranges (ie. Type A Conservation Areas)
• Corporate Numbering (numbers beginning 055)
• Personal Numbering, Radiopaging & Mobile numbers
• Special Services (numbers beginning 08)
• Premium Rate Services (numbers beginning 09)
• Access Codes

The information on the Telephone Numbers above is also available in Comma-Separated-Variable (CSV) format for downloading. To download (your attention is drawn to the Specification on the linked page which lists changes to fields in the files)

• Number Portability Prefix Codes ("NPPC")
• Carrier Pre Selection ("CPS") Codes
• Communications Provider Identity ("CUPID") codes
• Reseller Identity ("RID") codes
  
• Mobile Network Codes ("MNC")
  

NB. Details of Targetted Transit Codes ("TTC"), National and International Signalling Point Codes ("NSPC") and ("ISPC") respectively, are not shown because of potential security issues. However, details of your own codes may be obtained by contacting Oftel's Numbering Unit.

NB. Due to the size of the file containing all Geographic Numbers, it has been divided into 3 parts for ease of use as follows:

Code and number blocks - 1130 00 to 1599 99
Code and number blocks - 1600 00 to 1997 99
Code and number blocks - 2000 00 to 2920 99

Geographic Number Ranges - issued in blocks of 1000 numbers ie. 'Type A Conservation Areas'

(NB. 9-digit numbers starting with 0500, and other 05 number ranges may be shown in this table, but are not available for Allocation)

Personal Numbering (070 numbers)
Radiopaging numbers (076 numbers)
Mobile numbers (077 to 079)

Freephone (0808 1X and 0808 2X ranges, & details on allocated 0800 10k ranges)
Local Rate (0845 XXX ranges)
National Rate (0870 XXX ranges)
Up to 5p - non internet (ranges 0844 2XX to 0844 9XX)
Up to 10p - non-internet (ranges 0871 2XX to 0871 9XX)
Internet for Schools (0820 XXX ranges)

Special Services - issued in blocks of 1000 numbers
(numbers beginning 08)

Freephone - (0800 XXXX ranges)
Internet - FRIACO (Flat Rate Internet Access Call Origination) - 0808 99XX ranges
Internet - Free to caller (0808 90XX ranges)
Internet - incorporating un-metered access up to 5p (0844 04XX ranges)
Internet - metered access up to 5ppm (0844 09XX ranges)
Internet - incorporating un-metered access up to 10p (0871 04XX ranges)
Internet - metered access up to 10ppm (0871 09XX ranges)

'Content' Services (090X XXX ranges)
'Non-Content' Services (091X XXX ranges)

Type A (eg. 100, 123, etc.)
Type B (ususally for Directory Enquiry (DQ) 118XXX services, Indirect Access, etc.)
Type C (usually operator own services)

NPPCs may be Allocated in response to requests from Communications Providers with Allocations of Telephone Numbers identified in the Number Portability Functional Specification as ranges for which portability should be provided. NPPCs are Allocated as single prefixes that identify the recipient Communications Provider, except for Geographic NPPCs which are Allocated in blocks of 100 in order to identify a recipient and the relevant switch in the relevant provider's Network.

Where a Communications Provider does not have an Interconnection agreement with a particular Communications Provider, a portability transit code will be required to allow porting to take place through a third party with whom both Providers have an Interconnect agreement.

CUPIDs replace LOPIDs which are recognised by the telecoms industry and may be a prerequisite on specific forms used by the industry for services such as Number Portability arrangements, Data Management Amendments (DMA), orders on phone book entries, etc.

CPS codes are four digit codes commencing with the digit 8 (e.g. 8XXX). The CPS codes will be Allocated by Oftel to Communications Providers solely in connection with Carrier Pre-Selection, a service that allows customers the choice of routing specific types of calls via a selected United Kingdom Communications Provider without the need to dial a prefix before making a call.

If a Communications Provider requests a second 8XXX CPS code, Oftel will Allocate an additional code provided a satisfactory justification of the need for a second code is given to Oftel. Oftel will consider such requests on a case-by-case basis. Communications Providers will not normally be Allocated more than two 8XXX codes for number conservation reasons.

A Communications Provider wishing to implement a second 8XXX code on an access Communications Providers' network may need to address consequential issues arising with the access Communications Provider concerned.

1. RIDs are three character alphabetic codes that may be used for administrative purposes when a reseller wishes to offer carrier pre-selection via a wholesale carrier (also known as a 'CPS Communications Provider').

2. The CPS Industry has accepted that there is no longer a requirement that BT develop functionality in its systems specifically to recognise RIDs, and to record RIDs against individual CPS customers.

3. The RID was originally intended to address two reseller-specific issues:

• In the event of a fault or query, the customer could be directed at the reseller rather than the CPS Communications Provider.
  
  
• If a reseller wished to change CPS Communications Provider, then additional CPS set-up orders (and reply slips) for each customer would not be required.

4. Potential CPS resellers should therefore note:

• Oftel will continue to issue a RID to any reseller requesting one.
  
  
• A RID is not mandatory for resellers wishing to offer CPS. The current CPS processes can support the provisioning of CPS via resellers without the use of the RID.
  
  
• Some CPS Communications Providers may request that their resellers obtain a RID for administrative purposes internal to the CPS Communications Provider.
  
  
• The RID may be quoted in the CPS reply slip number, providing the rules below are observed, and will not cause BT to reject the CPS reply slip.
  
  
• BT will scan in the RID. However, BT's systems will not be specifically recognising and recording the RID against individual customers' CLIs.
  
  
• The first three digits of the 11 digit reply slip number must be the CUPID. The remaining 8 digits can be alpha/numeric except that the letter O will not be accepted as an alpha character. All alpha characters must be in UPPER CASE.
  
  
• Customers who contact BT with a query about CPS will simply be directed to their 'alternative service provider', rather than being directed to either their CPS Communications Provider or reseller by name. (Note that this is exactly the same as the current processes for customers with indirect access.)
  
  
• If a reseller wishes to change from one CPS Communications Provider to another for wholesale conveyance, then an electronic order will need to be sent to BT for each customer by the appropriate CPSO. A standard CPS set-up charge will apply to each CLI.
  

MNCs are part of the International Mobile Station Identity ("IMSI") code that identify the subscribers host network. The MNC together with the Mobile Country Code ("MCC") uniquely identifies the home network of the mobile terminal or mobile user.

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