IP Scanning -- free software ?

I have 254 IPs and want to see which
ones are "in-use" over a 3 day period

What free software do you recommend ?
  ** example = http://angryip.org
Who is Participating?
nader alkahtaniConnect With a Mentor Network EngineerCommented:
Don S.Commented:
I second that suggestion.  I've been using the advanced IP scanner from famatech for years.  Simple, light weight and free.
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