How separate list equally by threads?

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C#

TPL

I have two lists.

var proxy = new List<string>(); // 4 proxies
var urls = new List<string>(); // 100 urls

I want that every proxy make 25 requests with urls. How separate it equality between threads?

What I have tried:

I try use Partitioner.Create, but cannot understand how separate it equality

var proxy = new List<string>();
           var urls = new List<string>();
           Parallel.ForEach(Partitioner.Create(0, urls.Count, urls.Count/proxy.Count),new ParallelOptions{MaxDegreeOfParallelism = 10},range =>
           {
               for (int i = range.Item1; i < range.Item2; i++)
               {
                   ....
               }
           });