requests only on IPv6 (or if the Internet service provider for the
remote host blocks ICMP packets, which is wrong, but unfortunately not
all too uncommon), \fBidnlookup\fP will have to time out on the IPv4
requests only on IPv6 (or if the Internet service provider for the
remote host blocks ICMP packets, which is wrong, but unfortunately not
all too uncommon), \fBidnlookup\fP will have to time out on the IPv4