I'd advise against using four variables, and instead, would advocate using a single array. For example:

my $addr = "25.255.2.0";
my @scalar = split(/\./, $addr);
[download]

Then later, you can use it just as you would a regular scalar:

print "The address is $scalar[0].$scalar[1].$scalar[2].$scalar[3]\n";

There are many advantages to using an array instead of multiple scalars, a simple one being that this could also be expressed more simply as:

print "The address is ",join('.',@scalar),"\n";

There are few differences between $scalar[1] and $scalar_2 otherwise.