using System; using System.Net.NetworkInformation; class MainClass { static void Main() { if (NetworkInterface.GetIsNetworkAvailable()) { NetworkInterface[] interfaces = NetworkInterface.GetAllNetworkInterfaces(); foreach (NetworkInterface ni in interfaces) { foreach (UnicastIPAddressInformation addr in ni.GetIPProperties().UnicastAddresses) { Console.WriteLine(" - {0} (lease expires {1})", addr.Address, DateTime.Now + new TimeSpan(0, 0, (int)addr.DhcpLeaseLifetime)); } } } else { Console.WriteLine("No network available."); } } }