Character class ranges only go up to the first number. So your character classes are asking for (AFAICT) 0-2 or 5 (the second 5 is ignored). Also, the regex is set to start matching at the beginning of the string, but the IP occurs in the middle. Lastly, the dot isn't doing what you think it's doing; it matches any character, not just a dot.

As long as your system guarentees that the lsattr command returns the address in dotted-quad form, this should work:

my $dotted_quad = do {
    my $allowed_numbers = join '|', 0 .. 255;
    my $quad = qr/(?: $allowed_numbers )/x
    qr/ $quad \. $quad \. $quad \. $quad /x;
};

. . . 
if( $ipadd =~ /($dotted_quad)/ ) {
    $ipaddress = $1;
}
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