DNSQuerySniffer shows all the DNS traffic on your system

NirSoft has announced the public availability of DNSQuerySniffer, a tiny (130KB, including a Help file) network sniffer which detects and displays your DNS traffic.

If you think this sounds just a little technical, then you’re right, but the program does have some interesting applications. Malware will often use DNS traffic to communicate with its operators, for instance, and so taking a closer look at your own system may reveal the signs of an infection (a large number of failed lookups to domains you don’t recognize, say).