open-source tool for filter out stats from dns logs

[Jeff Wright]

There might be some tools already out there (like Splunk) that do this
for you.  I think you can get a free Splunk license if you parse
relatively small amounts of daily data.  If you're particularly
concerned about open-source, this thread might also help:
http://stackoverflow.com/questions/183977/what-commercial-and-open-source-competitors-are-there-to-splunk.

Regards,

Jeff