جستجوی آزاد بودن دامنه

[gerdioz]

سلام
دوستان
چطور میشه فهمید یک دامنه آزاد هست ؟
مثل whois

[سوداگر]

کلاسی برای اینکار دیدم (سایتش Fیلتر بود) کدش رو میذارم:

using System;
using System.IO;
using System.Text;
using System.Net.Sockets;
using System.Collections.Generic;

namespace WebTools
{
/// <summary>
/// A class to lookup whois information.
/// </summary>
public class Whois
{
public enum RecordType { domain, nameserver, registrar };

/// <summary>
/// retrieves whois information
/// </summary>
/// <param name="domainname">The registrar or domain or name server whose whois information to be retrieved</param>
/// <param name="recordType">The type of record i.e a domain, nameserver or a registrar</param>
/// <returns>The string containg the whois information</returns>
public static string lookup(string domainname, RecordType recordType)
{
List<string> res = lookup(domainname, recordType, "whois.internic.net");
string result = "";
foreach (string st in res)
{
result += st + "\n";
}
return result;
} /// <summary>
/// retrieves whois information
/// </summary>
/// <param name="domainname">The registrar or domain or name server whose whois information to be retrieved</param>
/// <param name="recordType">The type of record i.e a domain, nameserver or a registrar</param>
/// <param name="returnlist">use "whois.internic.net" if you dont know whoisservers</param>
/// <returns>The string list containg the whois information</returns>
public static List<string> lookup(string domainname, RecordType recordType, string whois_server_address)
{
if (whois_server_address == "")
whois_server_address = "whois.internic.net";
TcpClient tcp = new TcpClient();
tcp.Connect(whois_server_address, 43);
string strDomain = recordType.ToString() + " " + domainname + "\r\n";
byte[] bytDomain = Encoding.ASCII.GetBytes(strDomain.ToCharArray());
Stream s = tcp.GetStream();
s.Write(bytDomain, 0, strDomain.Length);
StreamReader sr = new StreamReader(tcp.GetStream(), Encoding.ASCII);
string strLine = "";
List<string> result = new List<string>();
while (null != (strLine = sr.ReadLine()))
{
result.Add(strLine);
}
tcp.Close();
return result;
}
}
}
سپس به این صورت دامنه رو بررسی میکنید:
string info = Whois.lookup("google.com", Whois.RecordType.domain);
یا برای گرفتن اطلاعات چند سایت:
List<string> info = Whois.lookup("google.com", Whois.RecordType.domain, "whois.internic.net");
منبع (http://coderbuddy.wordpress.com/2010/10/12/a-simple-c-class-to-get-whois-information/)

یه ابزار دیگه (http://www.c-sharpcorner.com/UploadFile/167ad2/network-tool-whois-in-C-Sharp/)
موفق باشید