Check a number in your browser
Choose the carrier, messaging, caller name or spam fields you need. Review the cost before a live lookup, then see your results and lookup history.
Start with a sample
Phone-number intelligence for business
Better phone data.
Live lookups are paid. Browser, CSV and API access.
Better phone data.
Better business decisions.
Find the voice carrier, messaging provider, caller name and reported spam information behind U.S. phone numbers.
Use it to investigate contact issues, enrich a customer list,
or build number intelligence into your own tools.
Live lookups are paid. Browser, CSV and API access.
One number can have two providers.
- Voice carrier
- Peerless Network
- Messaging provider
- Twilio
Look up the fields that matter
Carrier & routingMessaging providerCaller nameSpam reports
Three ways to work
In your browser
From a file
In your code
From one question to your whole workflow.
Enrich a CSV
Upload your file, choose the phone-number column and select your data fields. Review the estimated cost before confirming the job. Track its progress and download the completed results.
Create your workspaceConnect the API
Explore request and response examples with fixed samples. Create a key, select the fields your integration needs and fund your wallet before sending live requests.
Read the API reference
Pay for the fields you choose
Start with samples. Add live data when you are ready.
Explore fixed sample responses at no charge. Live lookups use your funded wallet.
Less than a penny a number.
- Carrier & routing
- Messaging provider
- Caller name
- Spam evidence
Understand the response fields
Illustrative fields, not platform activity or a live number lookup.
- Routing number
- LRN
- Voice carrier
- Carrier and line type
- Reported spam evidence
- Status when checked
- Messaging
- Messaging provider
Available fields depend on the products selected. A missing field or absence of reports does not establish that a number is safe.
Try the API — Right Here
Enter your API key and make a live phone number lookup. Sign up free and test the API free in the sandbox.
Resources & Tools
Free tools, guides, and learning resources to help you master phone intelligence
SMS Segment Calculator
Calculate SMS segments, detect encoding, and optimize message length. See exactly where messages split.
Try Calculator →Free Phone Lookup
Look up any US phone number. Get carrier, line type, and location data instantly.
Try Free Tool →Comprehensive Guides
Deep dives into SMS deliverability, phone intelligence, fraud prevention, and compliance.
Browse Guides →Telecom Glossary
LRN, CNAM, OCN, TCPA, 10DLC, and more. Quick definitions for telecom terms.
View Glossary →Industry Solutions
VoIP, call centers, SMS marketing, financial services, and more use cases.
View Solutions →Popular Guides
Free Tools
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Not a developer? Meet Lookup Pass
Take control of your phone.
Lookup Pass helps you check unfamiliar numbers and monitor your own number. Available on iPhone, Android and the web. Features vary by platform.
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Frequently Asked Questions
What is the average latency of your phone number intelligence APIs?
Response time varies with the selected data, batch size and operating conditions. Review the documented rate limits, handle errors and test your integration with fixed sample responses.
How do you ensure the accuracy of your spam and carrier data?
Responses report the carrier and spam information available for the selected lookup. Records can change, and an absence of spam reports does not establish that a number is safe.
What does the integration process look like?
Start with the API reference and fixed sample responses. Choose your fields, configure authentication and error handling, then fund your wallet before making live requests.
How does your pricing scale for high-volume traffic?
Live lookup charges depend on the selected products and your account pricing. See the published prices above and the pricing page for current rates. Fixed sample responses are free; live requests use your funded wallet.
How does your Trust API differ from simple blocklists?
The Trust API returns the trust and spam fields documented for the selected endpoint. Review the response examples and error handling before using these signals in a decision; a score or absence of reports does not establish that a number is safe.