use Data::Dumper;
use HTML::TreeBuilder::XPath;

my $html = q|
<ul><li>The following Host Names were requested from a host database:</li>
<ul>
<li>192.5.5.241</li>
<li>192.5.5.242</li>
</ul></ul>
|;

my $tree = HTML::TreeBuilder::XPath->new;
$tree->parse($html);
$tree->eof;

my @wanted;

my @nodes = $tree->findnodes('//ul');
for my $node ( @nodes ) {
	my $text = $node->findvalue('li') or next;
	$text =~ m/^The following Host Name/ or next;
	@wanted = $node->findvalues('ul/li');
	last;
}
print Dumper \@wanted;