How to convert CIDR to network and IP address range in C#?

Question

I have been looking around quite a bit to find some C# code to convert a network in CIDR notation (72.20.10.0/24) to an IP address range, without much luck. There are some threads about CIDR on stackoverlow, but none seems to have any C# code and cover exactly what I need. So I decided to cook it myself, and I did not want the code to rely on System.Net for any conversions in this version. Perhaps it may be of help to someone. References: What's the best way to convert from network bitcount to netmask? "Whatmask" C code from http://www.laffeycomputer.com/whatmask.html Usage: ``` uint startIP, endIP; Network2IpRange("72.20.10.0/24", out startIP, out endIP); ``` The code assumes 32 bits for everything. ``` static void Network2IpRange(string sNetwork, out uint startIP, out uint endIP) { uint ip, /* ip address */ mask, /* subnet mask */ broadcast, /* Broadcast address */ network; /* Network address */ int bits; string[] elements = sNetwork.Split(new Char[] { '/' }); ip = IP2Int(elements[0…

Accepted Answer

I recommend to use the C# IPNetwork class from Github.

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

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);
```

It will ouput

```
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
```

Have fun.

How to convert CIDR to network and IP address range in C#?

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