If I do a locater search -> Devices -> By IP using 1.1.1.1 I get a response "No Models Found". If I do the same search by attribute Network_Address (selecting devices only), I do get a result.
Release : 20.2
Component : Spectrum Core / SpectroSERVER
The Devices By IP search reads the USMOtherIPAddresses attribute and this address was not listed in that attribute.
Reconfigure the model. The device IPAddress was updated but the device was not reconfigured so the USMOtherIPAddresses attribute was not updated. Reconfigure the model by right clicking - Reconfiguration - Reconfigure Model.