Signal & Syntax · Networks, HLR and porting
What Is an HLR?
The HLR (Home Location Register) is the subscriber database in a mobile operator's core network. The HLR maps each number to its SIM and serving switch.The HLR (Home Location Register) is the subscriber database in a mobile operator's core network. The HLR maps each number to its SIM and serving switch.The HLR (Home Location Register) is the subscriber database in a mobile operator's core network. The HLR maps each number to its SIM and serving switch.
Also calledHome Location Register
Example
HLR in Practice
Every GSM and UMTS operator runs an HLR. For each incoming Every GSM and UMTS operator runs an HLR. For each incoming Every GSM and UMTS operator runs an HLR. For each incoming SMSSMS or call, the network asks the HLR where the subscriber is served. An HLR lookup sends the same question over or call, the network asks the HLR where the subscriber is served. An HLR lookup sends the same question over or call, the network asks the HLR where the subscriber is served. An HLR lookup sends the same question over SS7SS7 from outside the operator. 4G networks use the from outside the operator. 4G networks use the from outside the operator. 4G networks use the HSSHSS in the same role, and 5G uses the UDM. in the same role, and 5G uses the UDM. in the same role, and 5G uses the UDM.
Where ScoreMachine Fits
Related Terms
Read the Guide
Guide
HLR Lookup vs eHLR
Two ways to check whether a number is in use. Read the guide →Run the Checks on Your Own List
Upload a file in a free workspace, or walk through your use case with our team.