Home home location HLR lookup HLR lookup is a service that dynamically queries the central HLR database of a mobile network operator and checks whether a phone number is active or not. It can be useful for various purposes, including fraud prevention, data enrichment and SMS routing.
The home location register (HLR) is a database of information about subscribers authorized to use the global system for mobile communication (GSM) network, in particular the mobile station international subscriber directory number (MSISDN), and the international mobile subscriber identity (IMSI). The HLR is maintained by all operators that deliver services on 2G and 3G networks. Various companies offer services that enable their customers to query the HLR.
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When a telecommunications carrier wants to send a call or SMS message to a mobile phone subscriber it interrogates the mobile network provider’s HLR over the SS7 network to find out the IMSI code and other pertinent details. The HLR then identifies how to route the call or SMS message to the subscriber.
When a business uses HLR lookup to check the status of a phone number, it can save costs by avoiding sending messages to inactive numbers. The process is simple and quick – the company simply checks the contact against a list of numbers provided by the telecommunications network operator. HLR lookup can also be used to validate existing contacts, so that marketers are not wasting time and money calling or texting inactive numbers. It is worth noting that most numbers that are activated by a mobile network are not actually used by their owners.