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
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.
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.
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.
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.
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.
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Coming soon
Network Slicing: Configure and activate a URLLC slice
Create a new S-NSSAI (sst=2 URLLC), provision UDM/NSSF, and route a UE onto the new slice with a dedicated UPF and 5QI mapping.
Service-Based Architecture: NRF discovery in action
Register a new NF with the NRF, subscribe to profile updates, and watch how AMF/SMF dynamically discover peers on the SBI.
IMS call setup: VoNR from SIP INVITE to 200 OK
Trigger a VoNR call, watch the IMS registration, SIP INVITE through the P-CSCF/I-CSCF/S-CSCF, and the dedicated QoS flow created on the UPF.
Sandbox Labs are Pro-only. On a free account you'll be prompted to upgrade when you open a lab.See pricing →