CarrierLookup
Operator: On Time Telecom, Inc.
A web service for carrier and line type lookups, with free individual queries and a paid API.
People & Identity
Product
CarrierLookup.com: a carrier lookup for US numbers and a paid lookup API.
Availability and source date
Active
As of: 17 October 2026.
No functionality test has been performed.
Use in OSINT research
Returns the carrier for a known US telephone number and, according to the provider’s guide, the line type. The API can be integrated into your own applications.
Queries
| Input | Result | Result type |
|---|---|---|
| Phone number | Carrier and, according to the provider’s guide, line type, such as mobile, landline or VoIP. The web form accepts ten-digit US numbers. | Retrieved |
Features
- Look up the carrier for an entered US number.
- Distinguish between mobile, landline and VoIP according to the provider’s guide.
- Integrate phone queries into your own applications through the paid API.
Categories
- People & Identity
- Phone search
Coverage
Geographical coverage
USA
Dataset
Telephone network and carrier information. The web form is designed for ten-digit US numbers with the +1 country calling code; the provider’s guide mentions telecommunications databases.
Access
Requirements
Free individual lookup without signing in. An account is required to buy credits and access the API.
Export
Unknown
Provider
On Time Telecom, Inc.
Country of establishment
Unknown
Interfaces
API
Available. A paid CarrierLookup API; registration and prepaid queries are required. The home page does not link to public endpoint documentation.
MCP
Not documented. Not documented on the home page or in the provider’s guide.
AI agents
Not documented. Not documented on the home page or in the provider’s guide.
Legal note
Limitations
- The web form requires a ten-digit US number with the +1 country calling code.
- The provider notes possible discrepancies for numbers recently ported to another carrier.
Guides and practical reports
Official · CarrierLookup: look up carriers and line types
Tim Smith · 01/2026 · EN
Describes web lookups, line types and API use.