Free Phone Number Validator Online

Validate and format phone numbers for 240+ countries: E.164, international and national formats, country, calling code and line type (mobile, fixed line…).

Result

Press “Run” to see the result.

The Phone API parses a phone number written in any common way – with spaces, dashes, brackets, a leading 0 or a +country code – and tells you whether it is valid and possible for its country. It returns the detected country and name, the calling code, the national number and the number in four formats: E.164 (+84912345678), international, national and an RFC 3966 tel: URI.

It also detects the line type when the numbering plan allows it: MOBILE, FIXED_LINE, FIXED_LINE_OR_MOBILE, TOLL_FREE, PREMIUM_RATE, VOIP, SHARED_COST, PERSONAL_NUMBER, PAGER, UAN or VOICEMAIL. Validation uses the full metadata of Google’s libphonenumber (via libphonenumber-js), covering more than 240 countries and territories.

For numbers without a +country prefix, pass the ISO country code in country (e.g. VN, US); otherwise the caller’s country detected by Cloudflare is used, falling back to US. Unparseable input returns valid: false with a reason instead of an HTTP error.

Use this in your code

curl -X POST "https://apibox.io.vn/v1/phone" \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"number":"0912 345 678","country":"VN"}'

const res = await fetch('https://apibox.io.vn/v1/phone', {
  method: 'POST',
  headers: {
    Authorization: 'Bearer YOUR_API_KEY',
    'Content-Type': 'application/json',
  },
  body: JSON.stringify({
    "number": "0912 345 678",
    "country": "VN"
  }),
});
const data = await res.json();
console.log(data);

import requests

res = requests.post(
    "https://apibox.io.vn/v1/phone",
    headers={"Authorization": "Bearer YOUR_API_KEY"},
    json={"number": "0912 345 678", "country": "VN"},
    timeout=30,
)
print(res.json())

<?php
$ch = curl_init('https://apibox.io.vn/v1/phone');
curl_setopt_array($ch, [
    CURLOPT_RETURNTRANSFER => true,
    CURLOPT_CUSTOMREQUEST => 'POST',
    CURLOPT_HTTPHEADER => ['Authorization: Bearer YOUR_API_KEY', 'Content-Type: application/json'],
    CURLOPT_POSTFIELDS => '{"number":"0912 345 678","country":"VN"}',
]);
$response = curl_exec($ch);
print_r(json_decode($response, true));

API documentation → Get a free API key

FAQ

How do I validate a Vietnamese phone number?

POST {"number": "0912 345 678", "country": "VN"}. You get valid: true, type MOBILE and the E.164 form +84912345678. Numbers starting with +84 do not need the country parameter.

What is E.164 and why should I store numbers in it?

E.164 is the international format "+" + country code + number without spaces (e.g. +14155552671). It is unique, unambiguous and what SMS and voice providers like Twilio expect.

Does "valid" mean the number is in service?

No. It means the number matches the official numbering plan of its country. Whether it is currently assigned or reachable can only be confirmed by calling or sending an OTP.