Number Lookup API

Know the details behind every number, ensure message deliverability and gain your customers’ trust with Telnyx Phone Number Lookup and CNAM.

Questions? Ask our experts

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Get in the know with number lookup

The more you know about numbers, the more effective your communications will be. Telnyx Number Lookup allows our customers to find the carrier and caller information behind each phone number. This information can be used to help increase outbound calling productivity and outbound message deliverability, plus protect your business against spam and fraudulent inbound calls.


Don’t leave your communications to chance

Understand who you are communicating with for enhanced productivity and deliverability.

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    Real-time CNAM data

    Look up the nationally-maintained CNAM database to attach a caller ID name to your incoming calls–even if the other party has never called you before.

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    Detailed carrier information

    Know what carrier a number is attached to in order to understand cost and deliverability.

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    Access customer insights

    Know who you are calling with detailed information about the person behind the phone number. Protect your business against spam and fraud with Caller ID name info.


Send messages that deliver

Split landline and mobile numbers programmatically, and check carrier information to guarantee deliverability.


To streamline your processes

Increase security

When you know a customer can receive SMS, enable two-factor authentication (2FA) to verify their credentials to keep both your data and their data safe.


To keep data safe

Telnyx log in screen

Start building

Our code is your code.

curl -X GET \
  --header "Content-Type: application/json" \
  --header "Accept: application/json" \
  --header "Authorization: Bearer YOUR_API_KEY" \
  --globoff ""
  • Icon Resources Docs

    Retrieving caller name and carrier

    Number lookup and CNAM allow Telnyx users to look up a phone number and retrieve information about the phone number.

  • Icon Resources EBook

    Increase lead conversions with number lookup

    Implementing real-time intelligence into your inbound sales is the fastest way to start generating value with number lookup.

  • Icon Resources Article

    SMS marketing with Telnyx

    Three important features when choosing an SMS provider are pricing, global reach and being able to stay true to your brand.

Only pay for the information you need

Our pricing is split by carrier and caller information so you can cut your costs.

Starting at:


per lrn dip

What can you build with Telnyx Lookup API?


Number Lookup from Telnyx is a service that allows you to input a number and receive back information about the number carrier and caller ID.