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When you type a website in your browser, multiple DNS queries are sent from your computer to remote servers. DNS queries resolve website addresses (e.g. google.com) into IP addresses understandable by machines. If you wondered how many or what types of DNS queries are sent each time you visit a particular website, check out DNSQuerySniffer. It is a network sniffer utility that shows the DNS queries sent from your system.

For every DNS query it displays its Host Name, Port Number, Request type, Request time, Duration and other related information. To try it out, download and unzip the archive file on your system and run the executable file (DNSQuerySniffer.exe). Then, select the “Raw Sockets” option and click “OK”, if you are running Windows 2000 or XP. For other platforms you might need to install the WinPcap capture driver or the Microsoft Network Monitor driver.

It will instantly start capturing DNS packets on your system. To test it, simply open a website in your browser and watch the queries filling up the program window.

capture dns queries

You can pause the capture process at any time by pressing the “Stop Capture” button, to resume click “Start Capture”. You can copy or export any individual query with a right-click of your mouse or export all the items to a file in a xml, csv or html format.

dnsquerysniffer

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Features:

  • Freeware.
  • Shows DNS queries sent from your computer.
  • Detailed info for every DNS packet –  Host Name, Port Number, Request type, Request time, Duration etc.
  • Copy, export DNS queries in csv, xml and html format.
  • Pause and resume capture at any time.
  • 32-bit and 64-bit Windows versions are supported.

Check out DNSQuerySniffer @ http://www.nirsoft.net/utils/dns_query_sniffer.html

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