A slightly different approach so as to replace each digit of the masked octets with an 'x' rather than the whole octet with a single 'X' just as an exercise.
$ perl -Mstrict -Mwarnings -E '
open my $inFH, q{<}, \ <<EOD or die $!;
10.128.99.190 10.128.100.100
1.1.1.1 2.2.2.2
3.3.3.3 4.4.4.4
100.100.100.100 200.200.200.200
EOD
print for
map {
s{ (\d+\.\d+) (?= (?:\.\d+){2} ) }
{ do{ my $c = $1; $c =~ tr{0-9}{x}; $c } }xeg;
$_;
} <$inFH>;'
xx.xxx.99.190 xx.xxx.100.100
x.x.1.1 x.x.2.2
x.x.3.3 x.x.4.4
xxx.xxx.100.100 xxx.xxx.200.200
$
I hope this is of interest.
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