Looks like an old thread may have been reactivated, but for sorting IP numbers
take a look at
Sorting TCP/IP Addresses, and the like
http://www.mvps.org/dmcritchie/excel/sorttcp.htm
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HTH,
David McRitchie, Microsoft MVP - Excel [site changed Nov. 2001]
My Excel Pages: http://www.mvps.org/dmcritchie/excel/excel.htm
Search Page: http://www.mvps.org/dmcritchie/excel/search.htm