I blame your uninformative error message:
# Lookup domain with whois
$who = whois($d) or die "Cannot reach whois server";
# Get expiration date
if ($who =~ m/expir.*?(\d{2}-\w{3}-\d{4})/i) {
$edate = $1;
}elsif ($who =~ m|renewal-date.*?(\d{4}/\d{2}/\d{2})|i) {
$edate = $1;
}else{
$expires{$d} = "Whois failed";
next;
}
Once you replace your "Whois failed" with something more informative, it should become much clearer where the error lies:
$expires{$d} = "Whois failed for $d: Couldn't decipher '$who'"
+;
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