Sadly. Entering a domain name in the top field, and hitting enter, does nothing. It doesn't even post a query.
However. If I comment out the ip text field, and try it again. It works.
???
If you add a submit button, then Enter will submit the form even if there are multiple text inputs, at least in Firefox 25.0 (the only browser I tested). Without a submit button, Enter submits the form only if there is a single text input but doesn't submit the form if there are multiple text inputs.
The following works for me:
#!/strawberry/perl/bin/perl.exe
use strict;
use warnings;
use CGI;
use CGI::Carp qw(fatalsToBrowser);
use Net::Whois::Raw;
use Net::Whois::ARIN;
$Net::Whois::Raw::OMIT_MSG = 1;
$Net::Whois::Raw::CACHE_TIME = 1;
$Net::Whois::Raw::TIMEOUT = 8;
my $q = new CGI;
my $domname = $q->param("domname");
my $ip = $q->param("ip");
print "content-type:text/html; charset=utf-8\n\n";
print qq(<!DOCTYPE html>
<head><title>igwhois</title></head><body>);
print qq(
<form method="post">
<fieldset>
<label for="domname">Domain: </label><input type="text" name="domn
+ame" /><br />
<label for="ip">IP: </label><input type="text" name="ip" />
</fieldset>
<input type="submit" value="Submit">
</form>
);
if (!$domname) {
print "";
} else {
my $text = get_whois($domname, undef, "QRY_LAST");
print qq(<pre>);
print $text;
print qq(</pre>);
}
my $w = Net::Whois::ARIN->new(
host => 'whois.arin.net',
port => 43,
timeout => 30,
);
if (!$ip) {
print "";
} else {
my $text = $w->query("n + $ip");
print qq(<pre>);
print $text;
print qq(</pre>);
}
print qq(</body></html>);