Well done for providing some code to illustrate the problem. Unfortunately what your code demonstrates is merely that the target addresses are not responding to the Net::Ping tests, it passes no judgement on whether or not the addresses are "recognized".

use strict;
use warnings;

use Test::More tests => 7;
use Net::Ping;

my $p = Net::Ping->new;
for my $host (qw/www.perlmonks.org tcpbin.com/) {
    ok $p->ping ($host), "$host pinged";
}
for my $host (qw/www.ibm.com www.whitehouse.gov/) {
    ok !$p->ping ($host), "$host blocks pings";
}
for my $host (qw/lsdfskf wocka.wocka 192.168.1/) {
    ok !$p->ping ($host), "$host doesn't respond because it won't reso
+lve";
}
[download]

Note how the second and third sets behave the same in terms of the false return value from the ping method despite failing in different ways.

---

---

Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!

Titles consisting of a single word are discouraged, and in most cases are disallowed outright.

Read Where should I post X? if you're not absolutely sure you're posting in the right place.

Please read these before you post! —

• How do I compose an effective node title?
• How do I post a question effectively?
• Markup in the Monastery

Posts may use any of the Perl Monks Approved HTML tags:

a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr

You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)

	For:		Use:
	&		&
	<		&lt;
	>		&gt;
	[		&#91;
	]		&#93;

Link using PerlMonks shortcuts! What shortcuts can I use for linking?

See Writeup Formatting Tips and other pages linked from there for more info.