Today, I’ll teach you how to use the free numlookupapi.com API and the Apipheny API integrator to validate a list of phone numbers.

numlookupapi.com is a phone number validation service that checks and verifies phone numbers’ accuracy, carrier, and location, ensuring valid contacts for businesses, enhancing communication, and reducing undelivered messages.

To validate phone numbers in Google Sheets using numlookupapi.com, follow these steps:

  1. Install Apipheny
  2. Generate an API key
  3. Use Apipheny to validate phone numbers in your Google Sheet

Step 1.) Install and open the Apipheny add-on for Google Sheets

Apipheny is a free API connector for Google Sheets. You can use Apipheny to connect your Google Sheets to API data sources, easily.

1.) Install Apipheny by opening the following link on desktop and then clicking the Install button in the Google Marketplace: https://apipheny.io/install

2.) After you’ve installed Apipheny, open a Google Sheet and then click on the Extensions dropdown in the menu at the top.

In the dropdown list you should see Apipheny. Click Apipheny then click Import API to open the Apipheny sidebar in your Google Sheet.

open apipheny

Tip: you can open a new Google Sheet by entering this URL in your browser: sheet.new

Step 2.) Generate an API key

After logging in to your numlookupapi.com account, go to API Keys and copy your API key from there:

Copy and paste your API key in a safe location because you’ll need it in the next steps.

Step 3.) Use Apipheny to validate a list of phone numbers

Imagine you have the following table, and you want to check if the phone number is valid or not:

To achieve this, we create and save a new Apipheny request:

  1. The API URL Path (1) is not that important as we will overwrite it when using it. You can use https://api.numlookupapi.com/v1/validate/+111111 as a placeholder for now
  2. Important here is adding the apikey parameter as a header (2) so it can be re-used when you overwrite the URL later
  3. Continue by saving (3) and giving the request a name

After that, you go into your saved request and copy the request ID:

=APIPHENY("req-xxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx")

The second parameter of the APIPHENY function lets you overwrite the request URL. We will use this functionality to inject the email address of the corresponding row.

Now let’s use the saved function with an URL overwrite, and some other Google Sheets functions to build the following:

=INDEX(ARRAY_CONSTRAIN(TRANSPOSE(APIPHENY("req-xxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx";"https://api.numlookupapi.com/v1/validate/"&A1));100;2);MATCH("valid";ARRAY_CONSTRAIN(TRANSPOSE(APIPHENY("req-xxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx"; "https://api.numlookupapi.com/v1/validate/"&A1));100;1);0);2)

This will fetch the data from numlookupapi.com and filter down to only the value of the field with the key valid. You can use any other field specified in the documentation

If we insert this function into B1 and pull it down, it will fill column B with the validity of the phone number like so:



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