IP与主机名解析(C#)

// 解析IP到域名
private string GetHostNameByIP(string ipAddress)
{
IPHostEntry hostInfo = Dns.GetHostByAddress(ipAddress);
return hostInfo.HostName;
}
// 解析域名到IP
private string GetIPByHostName(string hostName)
{
System.Net.IPHostEntry hostInfo = Dns.GetHostByName(hostName);
return hostInfo.AddressList[0].ToString();
}