Dominican Republic Phone Numbers: Format, Area Code & Validation Guide

Quick Reference

• Country: Dominican Republic
• Country Code: +1
• International Prefix: 011
• National Prefix: 1
• ITU-T Recommendation: E.164

Overview

Discover the detailed telephone numbering plan of the Dominican Republic. This guide explains phone number structures, dialing procedures, and technical considerations crucial for telecom professionals, developers, and businesses. As a part of the North American Numbering Plan (NANP), the Dominican Republic shares the country code +1 with other NANP countries but has unique number ranges and formats.

Number Formats

General Number Structure

The Dominican Republic employs a fixed-length 10-digit phone number format, including the country code:

• Format: +1 NXX-XXX-XXXX
  • N: Any digit from 2-9 (area code)
  • X: Any digit from 0-9 (subscriber number)

Geographic (Landline) Numbers

Geographic numbers are structured as follows:

• Format: +1 NXX-XXX-XXXX
  • Area Codes: 809, 829, 849
  • Subscriber Number: 7 digits

Example:

• +1 809-555-1234
• +1 829-678-9012

Mobile Numbers

Mobile numbers follow the same format as landlines but are typically associated with specific prefixes:

• Format: +1 NXX-XXX-XXXX
  • Mobile Prefixes: 809, 829, 849
  • Subscriber Number: 7 digits

Example:

• +1 849-555-6789
• +1 829-123-4567

Toll-Free Numbers

Toll-free numbers are designated by specific prefixes:

• Format: +1 800-XXX-XXXX
  • Prefix: 800, 833, 844, 855, 866, 877, 888
  • Subscriber Number: 7 digits

Example:

• +1 800-123-4567
• +1 888-987-6543

Premium Rate Numbers

Premium rate services use the prefix 900:

• Format: +1 900-XXX-XXXX
  • Prefix: 900
  • Subscriber Number: 7 digits

Example:

• +1 900-234-5678

Numbering Scheme Explanation with Regular Expressions

To validate phone numbers in the Dominican Republic, use these regular expressions:

• General Format: ^\+1[2-9]\d{2}[2-9]\d{6}$
• Geographic Numbers: ^\+1(809|829|849)[2-9]\d{6}$
• Mobile Numbers: ^\+1(809|829|849)[2-9]\d{6}$
• Toll-Free Numbers: ^\+1(800|833|844|855|866|877|888)\d{7}$
• Premium Rate Numbers: ^\+1(900)\d{7}$

Dialing Procedures

Domestic Calls

• Landline to Landline: Dial 1 + NXX-XXX-XXXX
• Landline to Mobile: Dial 1 + NXX-XXX-XXXX
• Mobile to Mobile: Dial 1 + NXX-XXX-XXXX
• Mobile to Landline: Dial 1 + NXX-XXX-XXXX

International Calls

• Outgoing: Dial 011 + Country Code + NXX-XXX-XXXX
• Incoming: Dial +1 + NXX-XXX-XXXX (where NXX is the area code)

Number Portability

The Dominican Republic supports mobile number portability (MNP), allowing subscribers to keep their mobile numbers when switching providers. This fosters competition and offers consumers more flexibility.

Major Telecom Operators and Number Ranges

1. Claro Dominicana (formerly Codetel)
   • Number Range/Prefix: 809, 829, 849
2. Altice Dominicana (formerly Orange Dominicana)
   • Number Range/Prefix: 809, 829, 849
3. Viva (Trilogy Dominicana)
   • Number Range/Prefix: 809, 829, 849

Number Allocation and Management

The Instituto Dominicano de las Telecomunicaciones (INDOTEL) regulates and manages the numbering plan in the Dominican Republic, ensuring compliance with ITU-T recommendations.

Technical Restrictions and Special Cases

• Golden Numbers: Premium numbers that are easy to remember and may be sold at a higher price.
• Number Blocking: Certain prefixes or number ranges may be blocked for security or regulatory reasons.

Technical Considerations for Developers

When integrating Dominican Republic phone numbers into systems or applications, consider:

1. Validation: Use the provided regular expressions to validate phone numbers.
2. Formatting: Store and display numbers in the E.164 format.
3. Portability: Account for number portability in systems interacting with mobile numbers.
4. Time Zones: Consider the local time zone (Atlantic Standard Time, UTC-4) when scheduling calls or messages.

For the most current telecommunications regulations in the Dominican Republic, visit the official INDOTEL website.