Extension API

vonage · Company

Company No Auth Free & Open API

The Vonage Business Cloud Extension API enables you to retrieve information about extensions. Your application must subscribe to the Provisioning API suite to use this API.

Authentication

No authentication requiredFree to use with no key needed.

Sample Requests

GET Get account extensions data by account ID

Get account extensions data by account ID

https://api.apis.guru/v2/specs/vonage.com/extension/1.11.8/api/accounts/{account_id}/extensions?page=1&email=[email protected]&page_size=10&login_name=example&location_id=1&phone_number=example

Hover any highlighted part to learn what it does

curl -X GET "https://api.apis.guru/v2/specs/vonage.com/extension/1.11.8/api/accounts/{account_id}/extensions?page=1&email=test%40example.com&page_size=10&login_name=example&location_id=1&phone_number=example"

import requests
params = {
    "page": "1",
    "email": "[email protected]",
    "page_size": "10",
    "login_name": "example",
    "location_id": "1",
    "phone_number": "example"
}
response = requests.get(
    "https://api.apis.guru/v2/specs/vonage.com/extension/1.11.8/api/accounts/{account_id}/extensions",
    params=params,
)
print(response.json())

const url = new URL('https://api.apis.guru/v2/specs/vonage.com/extension/1.11.8/api/accounts/{account_id}/extensions');
url.searchParams.set('page', '1');
url.searchParams.set('email', '[email protected]');
url.searchParams.set('page_size', '10');
url.searchParams.set('login_name', 'example');
url.searchParams.set('location_id', '1');
url.searchParams.set('phone_number', 'example');

const response = await fetch(url); 
const data = await response.json();
console.log(data);

package main

import (
	"fmt"
	"io"
	"net/http"
	"net/url"
)

func main() {
	baseURL, _ := url.Parse("https://api.apis.guru/v2/specs/vonage.com/extension/1.11.8/api/accounts/{account_id}/extensions")
	q := baseURL.Query()
	q.Set("page", "1")
	q.Set("email", "[email protected]")
	q.Set("page_size", "10")
	q.Set("login_name", "example")
	q.Set("location_id", "1")
	q.Set("phone_number", "example")
	baseURL.RawQuery = q.Encode()
	targetURL := baseURL.String()
	req, _ := http.NewRequest("GET", targetURL, nil)

	client := &http.Client{}
	resp, _ := client.Do(req)
	defer resp.Body.Close()
	body, _ := io.ReadAll(resp.Body)
	fmt.Println(string(body))
}

require "net/http"
require "json"

uri = URI("https://api.apis.guru/v2/specs/vonage.com/extension/1.11.8/api/accounts/{account_id}/extensions")
uri.query = URI.encode_www_form({
  "page" => "1",
  "email" => "[email protected]",
  "page_size" => "10",
  "login_name" => "example",
  "location_id" => "1",
  "phone_number" => "example"
})

http = Net::HTTP.new(uri.host, uri.port)
http.use_ssl = uri.scheme == "https"

req = Net::HTTP::Get.new(uri)

res = http.request(req)
puts JSON.parse(res.body)

<?php
$url = "https://api.apis.guru/v2/specs/vonage.com/extension/1.11.8/api/accounts/{account_id}/extensions?" . http_build_query([
    "page" => "1",
    "email" => "[email protected]",
    "page_size" => "10",
    "login_name" => "example",
    "location_id" => "1",
    "phone_number" => "example"
]);
$opts = ["http" => [
    "method" => "GET",
]];
$ctx = stream_context_create($opts);
$res = file_get_contents($url, false, $ctx);
print_r(json_decode($res, true));

GET Get extension data by account ID and extension number

Get extension data by account ID and extension number

https://api.apis.guru/v2/specs/vonage.com/extension/1.11.8/api/accounts/{account_id}/extensions/{extension_number}

Hover any highlighted part to learn what it does

curl -X GET "https://api.apis.guru/v2/specs/vonage.com/extension/1.11.8/api/accounts/{account_id}/extensions/{extension_number}"

import requests
response = requests.get(
    "https://api.apis.guru/v2/specs/vonage.com/extension/1.11.8/api/accounts/{account_id}/extensions/{extension_number}",
)
print(response.json())

const url = 'https://api.apis.guru/v2/specs/vonage.com/extension/1.11.8/api/accounts/{account_id}/extensions/{extension_number}';

const response = await fetch(url); 
const data = await response.json();
console.log(data);

package main

import (
	"fmt"
	"io"
	"net/http"
)

func main() {
	targetURL := "https://api.apis.guru/v2/specs/vonage.com/extension/1.11.8/api/accounts/{account_id}/extensions/{extension_number}"
	req, _ := http.NewRequest("GET", targetURL, nil)

	client := &http.Client{}
	resp, _ := client.Do(req)
	defer resp.Body.Close()
	body, _ := io.ReadAll(resp.Body)
	fmt.Println(string(body))
}

require "net/http"
require "json"

uri = URI("https://api.apis.guru/v2/specs/vonage.com/extension/1.11.8/api/accounts/{account_id}/extensions/{extension_number}")

http = Net::HTTP.new(uri.host, uri.port)
http.use_ssl = uri.scheme == "https"

req = Net::HTTP::Get.new(uri)

res = http.request(req)
puts JSON.parse(res.body)

<?php
$url = "https://api.apis.guru/v2/specs/vonage.com/extension/1.11.8/api/accounts/{account_id}/extensions/{extension_number}";
$opts = ["http" => [
    "method" => "GET",
]];
$ctx = stream_context_create($opts);
$res = file_get_contents($url, false, $ctx);
print_r(json_decode($res, true));

Postman Setup Guide

Get Postman ↗

See official documentation for authentication and setup.

What can you build with Extension API?

Extension API is a Company API. Developers commonly use company APIs for:

enriching CRM records with company firmographics
building lead-generation and prospecting tools
verifying business identity and registration details
monitoring competitors and market intelligence
powering B2B data enrichment pipelines

No authentication required. This API is open — no signup or key needed. Ideal for quick prototypes and public-facing features. Extension API is free to use, making it a low-risk choice to experiment with.

New to APIs? Read our beginner's guide

Open documentation ↗