Reduce undeliverable messages, identify local-friendly number formats, do CNAM lookups, and protect yourself from fraud with Twilio Lookup. Find phone types, carriers, and more; Lookup allows you to programmatically ascertain information about phone numbers so you can be as effective as possible.

Not a developer? See our Lookup product page.  

Get Started with Lookup


Knowing your users is only a few lines of code away. Choose your programming language and dive into the quickstart, which will get you started using Lookup in PHP, Python, Node.js, C#, Ruby, Java, or with curl.

Build Your App

API Reference

Dive deeper into Lookup with our REST API reference and code samples.


Step-by-step instructions on how to build common features: