in reply to Detecting when my ISP changes my IP

How about this? 

use IO::Socket::INET;
$s = IO::Socket::INET->new (
     PeerAddr =>"1.2.3.4",
     Proto    =>"udp",
) or die "no socket!\n";

print $s->sockhost, " ", 
 scalar(gethostbyaddr($s->sockaddr,$s->sockdomain)),"\n";

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Re^2: Detecting when my ISP changes my IP
by Aristotle (Chancellor) on Sep 22, 2002 at 11:58 UTC
    That's more of an accidental feature than a reliable method. On machines with multiple network devices, it may bind from the wrong one. With a single network interface, there's simply no wrong interface to bind from.

    Makeshifts last the longest.

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