Solution
From NetIM Core Node netimsh
license_util info
Example:
netimadmin@n31-netimcore[netimsh]:~$license_util info
Setting DB to use = postgresql95
Modifying resource files for linux ...
Changing hostname to localhost. Modifying resource files ...
Changing database hostname to localhost. Modifying resource files ...
Modifying wrapper configuration files for linux ...
license-status active
serial-number active VRPJQ0087043C
license active LK1-PRD:NIM,BASE:#VRPJQ0087043C-0000-0000-5-21C0-19B9-9066 expires never
license active LK1-PRD:NIM,FEAT:COLL#1+63EA529A-0000-0000-5-8C52-F412-2AED expires never
license active LK1-PRD:NIM,FEAT:STNDRD-0000-0000-5-A1A9-8B7B-1D59 expires never
From NetIM WebUI
Configure > All Settings> Licensing
Serial number will be part of the license string for Base license.
license active LK1-PRD:NIM,BASE:#VRPJQ0087043C-0000-0000-5-21C0-19B9-9066 expires never
The NetIM serial number is the highlighted first section above (VRPJQ0087043C).
The serial number is tied to the license and will change if the license changes.