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DotLookup API

Free, open REST API for FMCSA carrier data. No API key required for basic lookups.

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Base URL

https://api.dotlookup.dev/v1

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Quick Start

Look up any carrier by DOT number — no signup needed: 
curl https://api.dotlookup.dev/v1/carriers/2233855

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What’s Available

Carrier Profiles

Full carrier details: address, contact, fleet size, authority status

Search

Text search with filters, geo/radius support, and pagination

Safety Data

Inspections, OOS rates, crash statistics, BASIC violations

Insurance

Active insurance policies with coverage details

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Authentication

Most endpoints work without authentication. Include an API key via the X-API-Key header for higher rate limits and access to the bulk lookup endpoint.

Authentication Guide

Learn how to authenticate your requests