https://rt.cpan.org/Public/Bug/Display.html?id=115579
IPTrie cannot find IP 0.1.2.3 in subnet 0.0.0.0/8.
$p->iaddress is defined for 0.0.0.0 but has numeric value 0.

Index: lib/Net/IPTrie.pm
--- lib/Net/IPTrie.pm.orig
+++ lib/Net/IPTrie.pm
@@ -168,7 +168,7 @@ sub find {
 		$p->$r(Net::IPTrie::Node->new(up=>$p));
 	    }else{
 		# Just return the closest covering IP block
-		if ( $p->iaddress ){
+		if ( defined $p->iaddress ){
 		    return $p;
 		}else{
 		    return $p->parent;