Telnyx Number Lookup API lets developers identify carrier and line type via Python

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A developer tutorial on DEV Community walks through building a Python Flask service that queries the Telnyx Number Lookup API to retrieve carrier name, line type, and portability status for any phone number. The service wraps the API with a 24-hour in-memory cache, so repeated lookups are served locally without additional API calls. Three endpoints handle lookups via JSON body, URL path, and cache inspection respectively. Common use cases include screening inbound calls, enriching sales leads, routing messages based on line type, and detecting number porting for compliance purposes. The full code is available in the Telnyx open-source examples repository on GitHub.

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