How to hide devices that not successful in SNMP scan

How to hide devices that not successful in SNMP scan

Hi,
My organization switches put in 192.168.1.1 to 192.168.1.254, but number of these switches is 15 switches. I added a new network scan with " Entire Network" option and 192.168.1.0 network address. After scan completion all my switches show in assets, but some empty ip address that not switch exist list in Switch Assets List. How to hide empty ip address from assets list.

Thanks  

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