Zonal network endpoint groups (NEGs) with GCE_VM_IP and GCE_VM_IP_PORT endpoints support IPv6-only endpoints that...

Zonal network endpoint groups (NEGs) with GCE_VM_IP and GCE_VM_IP_PORT endpoints support IPv6-only endpoints that reference IPv6-only or dual-stack Compute Engine VM network interfaces.

This feature is available in Preview.

For more information, see Zonal network endpoint groups overview.