e 164 phone number format with code examples

The E.164 format is an internationally standardized method of phone numbering that was developed by the International Telecommunications Union (ITU). This standard was created to ensure uniformity in phone numbering and to facilitate the routing of calls across different networks.

The E.164 phone number format consists of a country code, followed by the subscriber number. The country code is a two or three-digit number that identifies the country where the phone number is located. The subscriber number is usually between seven and fifteen digits long and may include both numbers and letters.

One of the key benefits of the E.164 numbering format is that it enables easy identification of the country code, which makes it easier to route calls across different networks and countries. In this article, we will provide an overview of the E.164 phone number format, along with some code examples.

E.164 Phone Number Format

The E.164 phone number format follows a specific structure that includes the country code, the national destination code (NDC), and the subscriber number. The format is as follows:

+[country code][NDC][subscriber number]

Here, the plus sign (+) indicates the international dialing prefix, which is followed by the country code, and then the rest of the phone number. Let's break down each component of the phone number format further:

Country Code

The country code is a two or three-digit number that identifies the country where the phone number is located. For instance, the country code for the United States is 1, while the country code for Canada is 1 as well. However, different countries can have the same country code, such as the case with the United Kingdom and France, both of which have a country code of 44.

National Destination Code (NDC)

The national destination code (NDC) is a three-digit number that identifies a specific geographic region within a country. In some cases, the NDC may be omitted, especially for mobile phone numbers. For example, the NDC for London in the United Kingdom is 20, so a London phone number in E.164 format would be +44 20 [subscriber number].

Subscriber Number

Finally, the subscriber number is the unique phone number assigned to a particular phone line. It can be between seven and fifteen digits long and can include both numbers and letters.

Code Examples

Here are some code examples of how to format an E.164 phone number in various programming languages:

Python

In Python, you can use the phonenumbers module to format a phone number in E.164 format. Here's how:

import phonenumbers


# create PhoneNumber object from string
phone_number = phonenumbers.parse("+14155552671", None)


# format phone number in E.164 format
formatted_number = phonenumbers.format_number(phone_number, phonenumbers.PhoneNumberFormat.E164)


# print formatted phone number
print(formatted_number)

Output:

+14155552671

Java

In Java, you can use the libphonenumber library to format a phone number in E.164 format. Here's how:

import com.google.i18n.phonenumbers.NumberParseException;
import com.google.i18n.phonenumbers.PhoneNumberUtil;
import com.google.i18n.phonenumbers.Phonenumber;


// create PhoneNumberUtil instance
PhoneNumberUtil phoneUtil = PhoneNumberUtil.getInstance();


try {
    // parse phone number from string
    Phonenumber.PhoneNumber phoneNumber = phoneUtil.parse("+14155552671", null);
    
    
    // format phone number in E.164 format
    String formattedNumber = phoneUtil.format(phoneNumber, PhoneNumberUtil.PhoneNumberFormat.E164);
    
    
    // print formatted phone number
    System.out.println(formattedNumber);
    
    
} catch (NumberParseException e) {
    System.err.println("NumberParseException: " + e.toString());
}

Output:

+14155552671

JavaScript

In JavaScript, you can use the libphonenumber-js library to format a phone number in E.164 format. Here's how:

import { parsePhoneNumberFromString, AsYouType } from 'libphonenumber-js';
  
  
// create PhoneNumber object from string
const phoneNumber = parsePhoneNumberFromString("+14155552671");


// format phone number in E.164 format
const formattedNumber = phoneNumber.formatInternational();


// print formatted phone number
console.log(formattedNumber);

Output:

+1 415-555-2671

Conclusion

In conclusion, the E.164 phone number format is an internationally standardized method of phone numbering that is used to ensure uniformity in phone numbering and to facilitate the routing of calls across different networks. It consists of a country code, followed by the national destination code (NDC), and then the subscriber number. The E.164 format makes it easy to identify the country code, which ensures that calls are routed correctly. Finally, we have also provided some code examples in Python, Java, and JavaScript to illustrate how to format a phone number in E.164 format.

let's discuss some more details about the E.164 phone number format and code examples.

The E.164 format also includes a few special characters, such as the plus sign (+) and a few other characters allowed for separating the country code, NDC, and subscriber number. Additionally, the format is independent of the telephone technology, so it can be used for landline, mobile, and even satellite phone numbers.

One major advantage of using the E.164 format is that it reduces the chance of dialing errors, particularly when it comes to international calls. Since every phone number in the world has a unique E.164 format, it eliminates any ambiguity that may arise due to differences in local conventions.

Furthermore, E.164 format makes it easier to construct applications and services that rely on phone numbers as it provides a standardized way to store, transmit, and validate phone numbers.

Now, let's look at some more examples of how to format phone numbers in E.164 format in different programming languages.

PHP

In PHP, you can use the libphonenumber-for-php library to format phone numbers in E.164 format. Here's an example:

require_once 'vendor/autoload.php';

use libphonenumber\PhoneNumberUtil;

$phoneUtil = PhoneNumberUtil::getInstance();

$phoneNumber = $phoneUtil->parse('+14155552671', null);
$formattedNumber = $phoneUtil->format($phoneNumber, PhoneNumberFormat::E164);

echo $formattedNumber;

Output:

+14155552671

Ruby

In Ruby, you can use the phonelib library to format phone numbers in E.164 format. Here's an example:

require 'phonelib'

def format_phone_number(number)
  phone = Phonelib.parse(number)
  phone.e164
end

number = "+14155552671"
formatted_number = format_phone_number(number)

puts formatted_number

Output:

+14155552671

C#

In C#, you can use the libphonenumber-csharp library to format phone numbers in E.164 format. Here's an example:

using System;
using PhoneNumbers;

class Program
{
    static void Main(string[] args)
    {
        PhoneNumberUtil phoneUtil = PhoneNumberUtil.GetInstance();
        string number = "+14155552671";
        PhoneNumber phoneNumber = phoneUtil.Parse(number, null);
        string formattedNumber = phoneUtil.Format(phoneNumber, PhoneNumberFormat.E164);
        Console.WriteLine(formattedNumber);
    }
}

Output:

+14155552671

In conclusion, the E.164 phone number format is a standard for phone numbering that provides many benefits when it comes to dialing and routing phone calls. The use of this format can facilitate the creation of applications and services that rely on phone numbers, and many libraries are available to format phone numbers in E.164 format in various programming languages.

Popular questions

  1. What is the purpose of the E.164 phone number format?

The purpose of the E.164 phone number format is to provide an internationally standardized method of phone numbering that ensures uniformity and allows for easier routing of calls across different networks and countries.

  1. What does the E.164 phone number format consist of?

The E.164 phone number format consists of a country code, followed by the national destination code (NDC), and then the subscriber number. The plus sign (+) is also used to indicate the international dialing prefix.

  1. What is the benefit of using the E.164 phone number format?

Using the E.164 phone number format provides many benefits, including reducing the chance of dialing errors, facilitating the creation of applications and services that rely on phone numbers, and providing a standardized way to store, transmit, and validate phone numbers.

  1. Can the E.164 format be used for all types of phone numbers?

Yes, the E.164 format can be used for all types of phone numbers, including landline, mobile, and satellite phone numbers.

  1. What code examples were provided in the article?

The article provided examples of how to format phone numbers in E.164 format in several programming languages, including Python, Java, JavaScript, PHP, Ruby, and C#.

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As a seasoned software engineer, I bring over 7 years of experience in designing, developing, and supporting Payment Technology, Enterprise Cloud applications, and Web technologies. My versatile skill set allows me to adapt quickly to new technologies and environments, ensuring that I meet client requirements with efficiency and precision. I am passionate about leveraging technology to create a positive impact on the world around us. I believe in exploring and implementing innovative solutions that can enhance user experiences and simplify complex systems. In my previous roles, I have gained expertise in various areas of software development, including application design, coding, testing, and deployment. I am skilled in various programming languages such as Java, Python, and JavaScript and have experience working with various databases such as MySQL, MongoDB, and Oracle.
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