Is there native .NET type for CIDR subnets?

Question

It's simple enough to code up a class to store/validate something like 192.168.0.0/16, but I was curious if a native type for this already existed in .NET? I would imagine it would work a lot like IPAddress:

CIDR subnet = CIDR.Parse("192.168.0.0/16");

Basically it just needs to make sure you're working with an IPv4 or IPv6 address and then that the number of bits your specifying is valid for that type.

Falsity

Answer 1

No there is such native type in .NET, you will need to develop one your self.

Tisiphone

Answer 2

You can use the code from GitHub to do just that:

https://github.com/lduchosal/ipnetwork

IPNetwork ipnetwork = IPNetwork.Parse("192.168.168.100/24");

Console.WriteLine("Network : {0}", ipnetwork.Network);
Console.WriteLine("Netmask : {0}", ipnetwork.Netmask);
Console.WriteLine("Broadcast : {0}", ipnetwork.Broadcast);
Console.WriteLine("FirstUsable : {0}", ipnetwork.FirstUsable);
Console.WriteLine("LastUsable : {0}", ipnetwork.LastUsable);
Console.WriteLine("Usable : {0}", ipnetwork.Usable);
Console.WriteLine("Cidr : {0}", ipnetwork.Cidr);

Output

Network : 192.168.168.0
Netmask : 255.255.255.0
Broadcast : 192.168.168.255
FirstUsable : 192.168.168.1
LastUsable : 192.168.168.254
Usable : 254
Cidr : 24

Mcmillon

Answer 3

For ASP.NET Core there is now IPNetwork class. Example usage below:

var addr = IPAddress.Parse("192.168.0.0");
var mask = 16;
var test = new IPNetwork(addr, mask).Contains(context.Connection.RemoteIpAddress);

Fiacre

Answer 4

IPNetwork is now available in the System.Net namespace starting with .NET 8.

IPNetwork n = IPNetwork.Parse("192.168.0.0/16");

Adventitia