Number Insight API

nexmo · Company

Company No Auth Free & Open API

The Number Insight API delivers real-time intelligence about the validity, reachability and roaming status of a phone number and tells you how to format the number correctly in your application. There are three levels of Number Insight API available: [Basic, Standard and Advanced](https://developer.nexmo.com/number-insight/overview#basic-standard-and-advanced-apis). The advanced API is available asynchronously as well as synchronously.

Authentication

No authentication requiredFree to use with no key needed.

Sample Requests

GET Advanced Number Insight (sync)

Provides [advanced number insight](/number-insight/overview#basic-standard-and-advanced-apis) information about a number synchronously, in the same way that the basic and standard endpoints do. Vonage recommends accessing the Advanced API **asynchronously** using the `/advanced/async` endpoint, to

https://api.apis.guru/v2/specs/nexmo.com/number-insight/1.2.1/advanced/{format}?ip=example&cnam=false&number=example&country=US&real_time_data=true

Hover any highlighted part to learn what it does

curl -X GET "https://api.apis.guru/v2/specs/nexmo.com/number-insight/1.2.1/advanced/{format}?ip=example&cnam=false&number=example&country=US&real_time_data=true"

import requests
params = {
    "ip": "example",
    "cnam": "false",
    "number": "example",
    "country": "US",
    "real_time_data": "true"
}
response = requests.get(
    "https://api.apis.guru/v2/specs/nexmo.com/number-insight/1.2.1/advanced/{format}",
    params=params,
)
print(response.json())

const url = new URL('https://api.apis.guru/v2/specs/nexmo.com/number-insight/1.2.1/advanced/{format}');
url.searchParams.set('ip', 'example');
url.searchParams.set('cnam', 'false');
url.searchParams.set('number', 'example');
url.searchParams.set('country', 'US');
url.searchParams.set('real_time_data', 'true');

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/nexmo.com/number-insight/1.2.1/advanced/{format}")
	q := baseURL.Query()
	q.Set("ip", "example")
	q.Set("cnam", "false")
	q.Set("number", "example")
	q.Set("country", "US")
	q.Set("real_time_data", "true")
	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/nexmo.com/number-insight/1.2.1/advanced/{format}")
uri.query = URI.encode_www_form({
  "ip" => "example",
  "cnam" => "false",
  "number" => "example",
  "country" => "US",
  "real_time_data" => "true"
})

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/nexmo.com/number-insight/1.2.1/advanced/{format}?" . http_build_query([
    "ip" => "example",
    "cnam" => "false",
    "number" => "example",
    "country" => "US",
    "real_time_data" => "true"
]);
$opts = ["http" => [
    "method" => "GET",
]];
$ctx = stream_context_create($opts);
$res = file_get_contents($url, false, $ctx);
print_r(json_decode($res, true));

GET Basic Number Insight

Provides [basic number insight](/number-insight/overview#basic-standard-and-advanced-apis) information about a number. Note that this endpoint also supports `POST` requests.

https://api.apis.guru/v2/specs/nexmo.com/number-insight/1.2.1/basic/{format}?number=example&country=US

Hover any highlighted part to learn what it does

curl -X GET "https://api.apis.guru/v2/specs/nexmo.com/number-insight/1.2.1/basic/{format}?number=example&country=US"

import requests
params = {
    "number": "example",
    "country": "US"
}
response = requests.get(
    "https://api.apis.guru/v2/specs/nexmo.com/number-insight/1.2.1/basic/{format}",
    params=params,
)
print(response.json())

const url = new URL('https://api.apis.guru/v2/specs/nexmo.com/number-insight/1.2.1/basic/{format}');
url.searchParams.set('number', 'example');
url.searchParams.set('country', 'US');

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/nexmo.com/number-insight/1.2.1/basic/{format}")
	q := baseURL.Query()
	q.Set("number", "example")
	q.Set("country", "US")
	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/nexmo.com/number-insight/1.2.1/basic/{format}")
uri.query = URI.encode_www_form({
  "number" => "example",
  "country" => "US"
})

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/nexmo.com/number-insight/1.2.1/basic/{format}?" . http_build_query([
    "number" => "example",
    "country" => "US"
]);
$opts = ["http" => [
    "method" => "GET",
]];
$ctx = stream_context_create($opts);
$res = file_get_contents($url, false, $ctx);
print_r(json_decode($res, true));

GET Standard Number Insight

Provides [standard number insight](/number-insight/overview#basic-standard-and-advanced-apis) information about a number. Note that this endpoint also supports `POST` requests.

https://api.apis.guru/v2/specs/nexmo.com/number-insight/1.2.1/standard/{format}?cnam=false&number=example&country=US

Hover any highlighted part to learn what it does

curl -X GET "https://api.apis.guru/v2/specs/nexmo.com/number-insight/1.2.1/standard/{format}?cnam=false&number=example&country=US"

import requests
params = {
    "cnam": "false",
    "number": "example",
    "country": "US"
}
response = requests.get(
    "https://api.apis.guru/v2/specs/nexmo.com/number-insight/1.2.1/standard/{format}",
    params=params,
)
print(response.json())

const url = new URL('https://api.apis.guru/v2/specs/nexmo.com/number-insight/1.2.1/standard/{format}');
url.searchParams.set('cnam', 'false');
url.searchParams.set('number', 'example');
url.searchParams.set('country', 'US');

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/nexmo.com/number-insight/1.2.1/standard/{format}")
	q := baseURL.Query()
	q.Set("cnam", "false")
	q.Set("number", "example")
	q.Set("country", "US")
	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/nexmo.com/number-insight/1.2.1/standard/{format}")
uri.query = URI.encode_www_form({
  "cnam" => "false",
  "number" => "example",
  "country" => "US"
})

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/nexmo.com/number-insight/1.2.1/standard/{format}?" . http_build_query([
    "cnam" => "false",
    "number" => "example",
    "country" => "US"
]);
$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 Number Insight API?

Number Insight 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. Number Insight API is free to use, making it a low-risk choice to experiment with.

New to APIs? Read our beginner's guide · Learn about API keys · What is REST?

Open documentation ↗