Fundamentals BroadNet answer

What is a number lookup API?

Last reviewed July 22, 20261 min readReviewed by BroadNet engineering

Quick answer

A number lookup API returns intelligence about a phone number in real time — whether it is valid and active, which country and operator it belongs to, whether it has been ported, and its line type. It queries the operator's HLR (or a number-intelligence database) so you can clean lists, route correctly, price accurately, and screen for fraud before you spend on a message or a call.

Plain-language definitionVendor-neutralReviewed July 22, 2026

The long answer

Everything worth knowing, nothing that isn't.

§01

What it tells you

Validity and reachability, current operator and country, ported status (via MNP), and often line type (mobile, landline, VoIP). That lets you drop dead numbers and route to the right network. See /answers/what-is-hlr-lookup and /answers/what-is-mnp.

§02

Why it saves money

Sending to invalid or wrong-country numbers wastes spend and depresses delivery rates; a lookup removes them before you pay. On large lists this is a direct, measurable saving. See /answers/how-to-reduce-sms-costs.

§03

Fraud and risk screening

Line type and porting signals help flag high-risk numbers — for example freshly-ported numbers in an account-takeover pattern — before an OTP or transaction proceeds. See /answers/telecom-fraud-prevention.

§04

How to use it

Validate at signup and before large campaigns, cache results sensibly, and combine with your OTP and routing logic. See /products/hlr-lookup and /answers/how-to-send-international-sms.

BNWritten by the BroadNet engineering team·Operating carrier-grade messaging since 2003, headquartered in Dubai·Editorial standards

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