I have found this query "SELECT ServiceTag FROM Orion.HardwareHealth.HardwareInfo WHERE NodeID = xxx" will get the main serial number for a few types of devices, but it doesn't work for most. I have been combing thru all the options in the SolarWinds Information Service v3.0 Schema Documentation, but cannot find anything that consistently works well. I am wondering if maybe Solarwinds Orion does not pull it. I guess if I have to I will pull it via snmp from the devices themselves, but I would rather use SW as my data gathering engine. I have to think Orion is already pulling this information.