seeking for range query

I am not to sure if this is the right ng for his posting.

If not, please notify me where to post it.



I have the following request:



I am looking for a free tool or web site which I can use to make a whole 
range query (e.g. 143.50.*.*) to find out which of the addresses in my 
B-Class net are listed on the common worldwide lists.



with kind regards,



Gasti Gillen

University of Graz in Austria