sometimes decommissioned ip device still visible in USM and you don't know which robot holds that data.
here is sql example to get to know which robot is source.
select a.name, c.robot, c.address from CM_COMPUTER_SYSTEM a
INNER JOIN CM_DEVICE b on b.cs_id = a.cs_id
INNER JOIN CM_NIMBUS_ROBOT c on c.dev_id = b.dev_src_id
where b.probe_name = 'niscache'
unfortunately, actual probe name predict is hard since probe_name is just categorized as "niscache".