Asp.net IP反查域名/主机名

public string GetHostNameByIp( string ip)
{
    ip = ip.Trim();
    if (ip == string .Empty)
        return string .Empty;
    try
    {
        // 是否 Ping 的通
        if ( this .Ping(ip))
        {
            System.Net.IPHostEntry host =
            System.Net.Dns.GetHostEntry(ip);
            return host.HostName;
        }
        else
            return string .Empty;
    }
    catch (Exception)
    {
        return string .Empty;
    }
}

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