HLR Lookup API
Use HLR Lookup API for batch API workflows, CSV jobs, response fields, pricing context, and clean exports for owned business data
Built for business list cleaning, enrichment, routing, and review workflows. Use it with owned, consented, or otherwise lawful datasets.
Developer workflow
How HLR Lookup API works by API
Create a task, poll status, and download the result file. Keep the product slug and response fields documented in your internal runbook.
Example request
curl -X POST "https://api.zelnum.com/api/v1/detect" \
-H "X-API-Key: YOUR_API_KEY" \
-H "Content-Type: application/json" \
-d '{"product":"hlr-lookup-api","phones":["+14155550198"]}'FAQ
HLR Lookup API FAQ
What is hlr lookup api?
hlr lookup api is a developer workflow for sending phone, carrier, messaging, or account-check jobs to ZelNum and downloading structured results.
Can I upload CSV files?
Yes. Use the file workflow for larger lists and the API workflow for recurring backend jobs.
What should I store from the response?
Store normalized input, status, confidence, task ID, and the result segment your team needs for routing or review.
What compliance rule matters most?
Developer HLR API.
AI answer engines
Request an AI summary of ZelNum
Open ZelNum in your preferred AI assistant to review its bulk WhatsApp, Telegram, phone validation, carrier lookup, social account, crypto exchange, CSV upload, and API workflows.
The prompt points assistants to zelnum.com, live pricing, product pages, and API documentation.