Real Labs · Sandbox

5G Core Sandbox

A guided simulated terminal for 5G core operations. Start NFs, register UEs, trigger handovers, break things, and fix them — every command responds with realistic 3GPP and Open5GS-style output, and a live topology diagram lights up to show you which NF is doing the work.

Available sandbox labs

beginner 20 min4 steps 3 questions

Your First 5G UE Registration

Boot a 5G core from scratch, start a gNB, and register your first UE. Watch the 5G-AKA authentication flow unfold across NRF, AMF, AUSF and UDM.

Registration 5G-AKA SUCI Tutorial

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intermediate 25 min4 steps 3 questions

Establishing a PDU Session

A UE is already registered. Establish a PDU session to DNN=internet, observe UPF selection and the PFCP session created on the UPF, then ping 8.8.8.8 through the data plane.

PDU Session PFCP UPF Selection

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intermediate 25 min4 steps 3 questions

Trigger an Xn Handover

A UE is on gNB-01 with an active internet session. Simulate the UE drifting into gNB-02 coverage, trigger the Xn handover, and verify the session survives the move.

Handover Xn Path Switch

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advanced 30 min4 steps 3 questions

Break the Core: What Happens When the UPF Dies

A UE is live with an active PDU session. Kill the UPF, watch the cascade of failures propagate from N4 heartbeat loss all the way back to the UE, then recover.

Failure UPF Recovery Advanced

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advanced 30 min5 steps 3 questions

Debug a Failed UE Registration

A newly provisioned UE keeps failing to attach while others work fine. Use AUSF and UDM tooling to find the misconfiguration, fix it, and verify registration succeeds.

Debug AUSF UDM Key Mismatch

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