Is your feature request related to a problem? Please describe.

I've been reading a blog post by Jon Skeet and noticed this code in it:

options.KnownNetworks.Add(new IPNetwork(IPAddress.Parse("130.211.0.0"), 22));

I think that this code is quite verbose and it would be easier to understand if it would be possible to use IP subnet syntax here.

Describe the solution you'd like

A new method:

public class IPNetwork
{
    public static IPNetwork Parse(string subnetString);
}

It could be used like this:

options.KnownNetworks.Add(IPNetwork.Parse("130.211.0.0/22")));

If this method was added, it would probably also make sense to add a Try version of it:

public static bool TryParse(string subnetString, out IPNetwork network);

What do you think?