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ITU-T E.164 (11/2010)

The international public telecommunication numbering plan

Recommendation ITU-T E.164 provides the number structure and functionality for the five categories of numbers used for international public telecommunication: geographic areas, global services, Networks, groups of countries (GoC) and resources for trials. For each of the categories, it details the components of the numbering structure and the digit analysis required to successfully route the calls. Annex A provides additional information on the structure and function of international public telecommunication numbers (hereafter referred to as "international ITU-T E.164-numbers"). Annex B provides information on network identification, service parameters, calling/connected line identity, dialling procedures and addressing for geographic-based ISDN calls. Specific ITU-T E.164-based applications, which differ in usage, are defined in separate ITU-T Recommendations.

Citation:	http://handle.itu.int/11.1002/1000/10688
Approval date:	2010-11-18
Approval process:	TAP
Status:	In force
Maintenance responsibility:	ITU-T Study Group 2
Further details:	Patent statement(s) Development history [1 related work items in progress]

Ed.	ITU-T Recommendation	Status	Summary	Table of Contents	Download
6.7	E.164 (2010) Amd. 1 (06/2011)	In force	here	-	here
6	E.164 (11/2010)	In force	here	here	here
5	E.164 (02/2005)	Superseded	here	here	here
4	E.164 (05/1997)	Superseded	here	here	here
3	E.164/I.331 (08/1991)	Superseded	-	here	here
2	E.164/I.331/Q.11 bis (11/1988)	Superseded	-	here	here
1	E.164/I.331 (10/1984)	Superseded	-	-	Not available


ITU-T Supplement	Title	Status	Summary	Table of contents	Download
E.164 Suppl. 2 (06/2020)	Number portability	In force	here	here	here
E.164 Suppl. 1 (03/1998)	Alternatives for carrier selection and network identification	In force	-	here	here
E.164 Suppl. 3 (05/2004)	Operational and administrative issues associated with national implementations of the ENUM functions	In force	here	here	here
E.164 Suppl. 3 (2004) Amd. 1 (11/2009)	-	In force	here	-	here
E.164 Suppl. 4 (05/2004)	Operational and administrative issues associated with the implementation of ENUM for non-geographic country codes	In force	here	here	here
E.164 Suppl. 4 (2004) Amd. 1 (11/2009)	-	In force	here	-	here
E.164 Suppl. 5 (11/2009)	Guidance with regard to the selection of numbers for helplines for children	In force	here	here	here
E.164 Suppl. 6 (03/2012)	Guidelines for identifying and selecting globally harmonized numbers	In force	here	here	here
E Suppl. 11 (06/2020)	Criteria for M2M/IoT-related assignments under Recommendation ITU-T E.164.1 and Recommendation ITU-T E.212 Annex A	In force	here	here	here
E-100 series Suppl. 1 (02/2019)	ITU-T E.100 series – Framework of disaster management for disaster relief system	In force	here	here	here

Title	Approved on	Download
Identify call location for emergency service	2020	here
ISDN Field Trial Guidelines	1991	here
ISDN Field Trial Guidelines	1991	here

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ITU-T Recommendations

ITU-T E.164 (11/2010)