API menu

Vonage / Number insight

Increase acquisition safely with phone number data

Protect yourself from fraud and spam

Nexmo is now called Vonage, but there are still references to Nexmo in our URLs, code snippets and message templates.

Vonage's Number Insight API lets you identify billions of phone numbers around the world and determine the best way to reach your customers using fresher data from real-time sources. Increase acquisition, assess risk, prevent fraud and block fake accounts – all without relying on customer input.

How it works

You can validate numbers from any location in the world, so you can be sure you have accurate information regardless of where users are using your app. Your app can ask users to enter a phone number during registration or you can identify existing numbers in your customer database. Your application passes the phone number to Vonage's Number Insight API for analysis. Number Insight queries multiple information sources to validate and gather information about the number. Vonage's Number Insight returns information on the phone number to your application so you can remove unreachable numbers and identify valid numbers as mobile or landline.

supplier logo full vonage
Number insight

GDPR compliance: Yes
SLA: Standard via the KPN Developer Portal


Coverage: Global
Data center location: US & EU
End-to-end encryption: Yes
Scalable infrastructure: Yes

ISO/IEC 27001:2013, 27017:2015 & 27018:2014
ISO 22301:2012 & 31000:2009
SOC 2 & 3 
NIST 800-171

This API helps you to...

icon Correct customer data

Keep your database up to date

By periodically validating the numbers in your customer database, you can be sure that customer numbers are still reachable, reducing delivery errors when running SMS or voice-based marketing campaigns.

Product page KPN Wholesale Wholesale MultiPlay API Why use icon Offer full set of services

Use the right channel

Validating information enables you to distinguish mobile from landline numbers  ensuring that you don’t try to send text messages to landlines if reaching out via SMS.

icon Protect customers against fraud

Minimize fraud By asking your custom

By asking your customer to provide a phone number  and then validating the legitimacy of that number  you can minimize fraud while ensuring that you have a way to contact that customer in the future.

What our customers say

Product page Vonage Number Insight API Testimonial Mobyquest
“After working with several cloud communications partners that provided inaccurate and pricey solutions, it was refreshing to find Vonage. We were able to fit our app’s logic with their flexible Number Insight API, giving Mobyquest the ability to chose which insights we want to receive and which ones we’d rather do without. We also required a solution that would work seamlessly with the same level of accuracy as we expand operations across Europe, and Vonage truly delivered.”
Nicolas Auboin
Lead Manager - Mobyquest


Accurate information

Gives the full registered name of the number owner (available for US numbers only).

Superior coverage

Offers accurate operator information, identifying mobile numbers that have been ported.

Determines caller type

Shows if the number is a virtual number, mobile or landline.

What it costs

Type of request



Best for formatting numbers and displaying
them in local format



Best for identifying number type, deciding between
SMS and voice, and blocking virtual numbers

€ 0,005


Best for determining risk

€ 0,030


All prices may be subject to change at any time.

Need help?

Contact our customer service.

Ask your questionFAQs