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en.wikipedia.org/wiki/Telephone_numbering_plan

A telephone numbering plan is a type of numbering scheme used in telecommunication to assign telephone numbers to subscriber telephones or other telephony endpoints. Telephone numbers are the addresses of participants in a telephone network, reachable by a system of destination code routing.

www.numberingplans.com/?page=plans&sub=phonenr

Numbering plans for phone numbers. Select the country of which you want to see the national numbering plan for telephone number ranges. ITU-T Recommendation E.164 sets the rules for country codes.

www.numberingplans.com

Analyses can be done on phone numbers, but also on IMEI, IMSI, IPSC, and SIM numbers. Subscription licences are available for professional or business use. On-line numbering plans. You can browse through the full numbering plan databases on-line. When doing so, you can look at the specifics of individual entries.

www.itu.int/oth/T0202

National Numbering Plans. Administrations are requested to notify ITU about their national numbering plan changes, or to give an explanation of their web page on national numbering plan as well as their contact points, so that the information, which will be available freely to all Administrations/ROAs and service providers, can be posted on ITU-T website.

en.wikipedia.org/wiki/E.164

E.164 is an ITU-T recommendation, titled The international public telecommunication numbering plan, that defines a numbering plan for the worldwide public switched telephone network (PSTN) and some other data networks. E.164 defines a general format for international telephone numbers.

www.nationalnanpa.com

NANPA: North American Numbering Plan Administrator. This site provides information about the North American Numbering Plan (NANP) and its administration. The NANP is the numbering plan for the Public Switched Telephone Network for Canada, the US and its territories, and some Caribbean countries.

numplans.com

Phone numbers are inserted on NNPC based on a “best matching criteria” that dramatically reduces and optimizes the total number of rows while still guarantees the full coverage of any national numbering plan.

www.techopedia.com/definition/8618/numbering-plan

A numbering plan is a telecommunication scheme through which telephone numbers are assigned to subscribers and telephony endpoints. Each telephone number is an address assigned to an endpoint in a network through which a designated subscriber can be reached.

www.ofcom.org.uk/.../0013/102613/national-numbering-plan.pdf

The National Telephone Numbering Plan 3 ‘Integrated Services Digital Network’ means a Network based on the existing digital Public Communications Network which provides digital links to Customers and end to end digital

simple.wikipedia.org/wiki/Telephone_numbering_plan

A telephone numbering plan is a system used in telecommunications to give telephone numbers to customers and to route telephone calls in a telephone network. A closed numbering plan imposes a fixed length to numbers, such as in North America (10-digit).