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.
e164.arpae164.orge.164National Significant Number (NSN)country codeinternational telephone numbernational destination code

Telephone numbering plan

Area codeCalling codearea codes
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.
The International Telecommunication Union (ITU) has established a comprehensive numbering plan, designated E.164, for uniform interoperability of the networks of its member state or regional administrations.

List of country calling codes

Country CodeDialing codeTelephone code
The presentation of a number is usually prefixed with the plus sign, indicating that the number includes the country calling code.
They are defined by the ITU-T in standards E.123 and E.164.

Public switched telephone network

public switched telephone networkPSTNtelephone network
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.163 was the former ITU-T recommendation for describing telephone numbers for the public switched telephone network (PSTN).
The E.163 and E.164 standards provide a single global address space for telephone numbers.

Telephone

telephonephonetelephones
E.163 was the former ITU-T recommendation for describing telephone numbers for the public switched telephone network (PSTN).
With the standardized international numbering system, E.164, each telephone line has an identifying telephone number, that may be called from any other, authorized telephone on the network.

Telephone number

telephone numberphone numbertelephone numbers
E.164 defines a general format for international telephone numbers.
In the international telephone network, the format of telephone numbers is standardized by ITU-T recommendation E.164.

Telephone number mapping

telephone number mappingENUME.164 Number Mapping
E.164 numbers may be used in the Domain Name System (DNS) of the Internet in which the second-level domain e164.arpa has been reserved for telephone number mapping (ENUM).
Internationally, telephone numbers are systematically organized by the E.164 standard, while the Internet uses the Domain Name System (DNS) for linking domain names to IP addresses and other resource information.

SIP URI scheme

When a number is mapped, a DNS query may be used to locate the service facilities on the Internet that accept and process telephone calls to the owner of record of the number, using, for example, the Session Initiation Protocol (SIP), a call-signaling VoIP protocol whose SIP addresses are similar in format (user@domain...) to e-mail addresses.
Such a number could be a private branch exchange or an E.164 telephone number dialled through a specific gateway.

ITU-T

CCITTITU-TTelecommunication Standardization Sector
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.163 was the former ITU-T recommendation for describing telephone numbers for the public switched telephone network (PSTN).

Voice over IP

VoIPvoice over IPvoice over Internet Protocol
When a number is mapped, a DNS query may be used to locate the service facilities on the Internet that accept and process telephone calls to the owner of record of the number, using, for example, the Session Initiation Protocol (SIP), a call-signaling VoIP protocol whose SIP addresses are similar in format (user@domain...) to e-mail addresses.
E.164 is a global FGFnumbering standard for both the PSTN and PLMN.

ITPCS

+991XC
This recommendation contains the criteria and procedures for an applicant to be temporarily assigned a three-digit identification code within the shared E.164 country code +991 for the purpose of conducting an international non-commercial trial.
Application templates addressed to the ITU for E.164 shared country codes and identification codes require descriptions of the "Public Correspondence Service" to be provided with those codes.

Carrier of Record

Carrier of Record (or COR), refers to the entity that provides PSTN service for an E.164 number.

Telephone numbers in Thailand

Area codeCalling code+66
Thailand's telephone numbering plan in Thailand is managed by the National Broadcasting and Telecommunications Commission (NBTC) in accordance with International Telecommunications Union's (ITU) recommendation E.164.

Telephone numbers in Azerbaijan

+994Azerbaijan
Telephone numbers in Azerbaijan follow the ITU Telecommunication Standardization Sector E.164 recommended format its telephone numbering plan.

North American Numbering Plan

Area codeArea codes<span style="white-space:nowrap;">Area code(s)
The North American Numbering Plan conforms with ITU Recommendation E.164, which establishes an international numbering framework.

Country code

country codecountry-codeInternet country code
The term country code frequently refers to international dialing codes, the E.164 country calling codes.

NRENum.net

The domain nrenum.net is being populated in order to provide the infrastructure in DNS for storage of E.164 numbers.

Telephone numbers in the United Kingdom

+440141dialling code
Number ranges starting 01 can have National Significant Number (NSN) length as 10 or 9 digits.

International Networks (country code)

international networks+883+882
In the +882-99 block, two numbering spaces are currently colliding: The numbering area has officially been assigned to Telenor but prior to this assignment, e164.org has started to assign unofficial numbers within that numbering area.

Telephone numbers in Switzerland

+41SwitzerlandSwiss telephone numbering plan
The Swiss telephone numbering plan implements the ITU-T recommendation E.164 and is designated E.164/2002, based on its last major revision in 2002.

Personal numbering

personal numberingPersonal numberspersonal numbering providers
Typically the national destination code used for this service is (0)70.

Area code 246

+1 246246+1246
However, this can cause confusion with Diego Garcia which is assigned the country code 246 under the International Telecommunications Union standard E.164.

GSM 03.40

3GPP TS 23.040 (originally GSM 03.40)3GPP 23.040 (originally GSM 03.40)3GPP 23.040
The number itself must always start with a country code and must be formatted exactly according to the E.164 standard.