The hostname seems to be "HP281ED8" = HP OfficeJet Pro 8610. MAC Address B4:2E:99:94:2E:6D is the PC issuing the scan. If I try to ping to this entry, sometimes (from a WiFi connected device) "Request timed out", sometimes (from a UTP connected device) ping leads to some other IP, typically the Chromecast (on Ethernet), Arrayent (Salus WiFi thermostat) or Roomba (WiFi vacuum cleaner).
Regards, NIKON_D90
Broadcast is that address for this mask.
Double-check the settings on the DHCP server, as maybe they are different than you expect.
HTH,
-Jim
You may also delete stored data. You can find this option in the following way: Advanced IP Scanner -> Settings -> Options -> Misc -> Delete stored data.