Yes, that's possible but it would take me a bit to figure out the SQL...
you would left join your tblassets table to tsysIPScanRanges on tblassets.ipnumeric >= tsysIPscanranges.ipstart and tblassets <= tsysipscanranges.ipend
But, the ip addresses in the tsysipcanranges are VARCHAR, so in order to compare the ranges, you have to remove the periods from the columns, then convert to NUMERIC -
that's a bit tricky for me.
but, then you could have the report, and report on max assetID grouped by tsysipscanranges.description
if that helps at all.