subnet

Does anyone have some code that will determine if an IP address (IPv4 or IPv6) is on the same subnet as the machine running the application? I've seen numerous examples of code that does this with IPv4 but I can't find any that support IPv6. EDIT: I'm unsure if I'm understanding all the differences between v4 and v6 so here's a bit more to my question. I have an application that serves both internet clients and intranet clients, that is to say there are clients that are on the same physical network as the server. So sometimes there are routers between the client and sometimes there aren't.

I want to get client subnet mask using c#. How can I get it? First of all, check NetworkInterface class first. There are a lot of information in it. And these articles will be helpful for you: IP Address Calculations with C# (Subnetmasks, Networks, …) Get Subnet Mask Finding subnet mask from IP4 address using c# It's impossible to know what subnet mask client's network is using (if we are talking about D and E class IP addresses). My assumption is that by "client" you mean a remote computer connected to your server. Otherwise see @Soner Gönül answer. 来源： https://stackoverflow.com/questions

For example: IP Address: 130.45.34.36 Mask: 255.255.240.0 What would be Net ID/Subnet Address, and Broadcast Address? Let's write both in binary: 130.45.34.36 = 10000010.00101101.00100010.00100100 255.255.240.0 = 11111111.11111111.11110000.00000000 A bitwise AND between the two would give us the network address: 10000010.00101101.00100010.00100100 (ip address) AND 11111111.11111111.11110000.00000000 (subnet mask) = 10000010.00101101.00100000.00000000 = 130.45.32.0 (the resulting network address) A bitwise OR between the network address and the inverted subnet mask would give us the broadcast

How do I go about calculating the Broadcast Address in Objective C I would like to have the Broadcast Address resolve to the same result as shown in the following Subnet Calculator - http://www.subnet-calculator.com/subnet.php I have the IP Address of my local IOS device and the Subnet Mask. And I know that the Broadcast Address uses the following formula broadcast = ip | ( ~ subnet ) (I am answering my self, as I have not seen this on the Internet anywhere, and also I am not aware of any libraries which perform this calculation. Happy to see if anyone else has a better solution or is aware of

I have a subnet in the format 10.132.0.0/20 and an IP address from the ASP.Net request object. Is there a .NET framework function to check to see if the IP address is within the given subnet? If not, how can it be done? Bit manipulation, I guess? Using the answers from Thomas and Chris together with Ciscos Subnetting Examples I finally got something to work for IPv4 and IPv6 if you use the CIDR notation (IPAddress/PrefixLength). My IPv6-Implementation might be a bit too straight forward but as there is no UInt128-datatype I couldn't adapt Thomas's solution. Here is the code that seems to work