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awk 'NR==FNR{X[$0]=$0;next}{for(i in X){if($0 ~ i){gsub(i,i" matched",$0)}}}1' file1 file2

Here is how to do it using ksh93.

#!/bin/ksh93

typeset -i2 mask=255

[[ $# != 2 ]] && {
echo "Usage: $0 ipaddress subnetmask"
exit 1
}

SaveIFS=$IFS
IFS=.
typeset -a IParr=($1)...