Comprehensive Guide to Djibouti Phone Numbers

Overview

Djibouti's phone numbering system is essential for anyone involved in telecommunications, development, or systems administration. This guide covers the structure of phone numbers, dialing procedures, and regulatory frameworks, ensuring you can effectively manage and interact with Djibouti's telecommunication systems.

Quick Reference

• Country: Djibouti
• Country Code: +253
• International Prefix: 00
• National Prefix: None
• Number Length: 8 digits (fixed and mobile)

Number Formats

Djibouti uses a closed numbering plan with an 8-digit format for both fixed-line and mobile numbers. Here's how they are structured:

General Structure

• Country Code: +253
• Total Number Length: 8 digits

Fixed-Line (Geographic) Numbers

• Prefix: 21
• Format: 21X{6}
• Example: +253 21 123456

Mobile Numbers

• Prefix: 77
• Format: 77X{6}
• Example: +253 77 123456

Regular Expressions for Validation

To validate Djibouti phone numbers, use these regular expressions:

• Fixed-Line Numbers:
  ^\+25321\d{6}$
  

• Mobile Numbers:
  ^\+25377\d{6}$
  

Summary Table of Number Formats

Service Type	Prefix	Number Length	Example Number	Regular Expression
Fixed-Line	21	8 digits	+253 21 123456	^\+25321\d{6}$
Mobile	77	8 digits	+253 77 123456	^\+25377\d{6}$

Dialing Procedures

Domestic Calls

• Landline to Landline: Dial the full 8-digit number directly.
• Landline to Mobile: Dial the full 8-digit number directly.
• Mobile to Mobile: Dial the full 8-digit number directly.

International Calls

• Outgoing: Dial 00 followed by the country code and the local number. For example, to call the United States, dial 00 1 XXX XXXX.
• Incoming: International callers should dial +253 followed by the 8-digit Djibouti number.

Number Portability

Djibouti supports number portability for both fixed-line and mobile services, allowing users to retain their phone numbers when switching providers. This enhances competition and consumer choice.

Major Telecom Operators and Number Ranges

The primary telecom operator in Djibouti is Djibouti Telecom, managing both fixed-line and mobile services. Number ranges include:

• Fixed-Line Numbers: Prefix 21
• Mobile Numbers: Prefix 77

Regulatory Body

The Djibouti Telecommunications Regulatory Authority (ATR) oversees the telecommunications sector, including number allocation and adherence to international standards like ITU-T Recommendation E.164.

Recent or Upcoming Changes

As of March 1, 2012, Djibouti transitioned from a 6-digit to an 8-digit numbering plan, aligning with ITU-T standards to accommodate growing demand.

Number Allocation and Management

Numbers are allocated by the ATR, ensuring compliance with international standards and meeting local market needs. The ATR assigns number ranges to operators and updates the national numbering plan as necessary.

Technical Considerations for Developers

For developers handling Djibouti's phone numbers, consider the following:

• Validation: Use the provided regular expressions.
• Number Formatting: Store and present numbers in the E.164 format (+253XXXXXXXX).
• Portability: Account for number portability in user accounts or telecom services.

This guide provides all the technical details necessary for effective interaction with Djibouti's telecommunication system, ensuring compliance with local and international standards.