From CGI Programming 101:
#!/usr/bin/perl -T
use strict;
use warnings;
use CGI qw(:standard);
use CGI::Carp qw(warningsToBrowser fatalsToBrowser);
use Socket;
print header;
print start_html("Remote Host");
my $ip = 'localhost';
my $hostname = gethostbyaddr(inet_aton($ip), AF_INET);
print "Welcome, visitor from $hostname!<p>\n";
print end_html;
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