How do I get the Local Network IP address of a computer programmatically?

Question

I need to get the actual local network IP address of the computer (e.g. 192.168.0.220) from my program using C# and .NET 3.5. I can\'t just use 127.0.0.1 in this case.

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Answer 1

If you know there are one or more IPv4 addresses for your computer, this will provide one of them:

Dns.GetHostAddresses(Dns.GetHostName())
    .First(a => a.AddressFamily == AddressFamily.InterNetwork).ToString()

GetHostAddresses normally blocks the calling thread while it queries the DNS server, and throws a SocketException if the query fails. I don't know whether it skips the network call when looking up your own host name.