http://www.anta.net/misc/telnet-troubleshooting/whois.shtml 表明我们可以使用 telnet 获取 whois 服务器
但是，webclient 使用 get 和 http 协议。
那么如何通过vb.net获取whois呢？
像 domainpunch 这样的软件可以获取大量的域信息。但是，他们不可能只查询 whois 服务器，因为其中大多数是速率限制的。
也许他们会查询大量的 whois 服务器。
或者怎么做？
【问题讨论】：
一个简单的TcpClient 就可以了。 WhoIs 是一个非常简单的协议：您只需连接并发送查询，然后发送 \r\n。
示例：
Private Sub Main()
Dim data = System.Text.Encoding.ASCII.GetBytes("stackoverflow.com" & Microsoft.VisualBasic.vbCr & Microsoft.VisualBasic.vbLf)
Using client = New TcpClient("whois.name.com", 43),
stream = client.GetStream()
stream.Write(data, 0, data.Length)
data = New Byte(255) {}
Dim responseData = String.Empty
Dim read = stream.Read(data, 0, data.Length)
While read > 0
responseData = System.Text.Encoding.ASCII.GetString(data, 0, read)
Console.Write(responseData)
read = stream.Read(data, 0, data.Length)
End While
End Using
End Sub
输出：
__ _ ____
| \ | | __ _ _ __ ___ ___ / ___|___ _ __ ___
| \| |/ _` | '_ ` _ \ / _ \ | | / _ \| '_ ` _ \
| |\ | (_| | | | | | | __/ _ | |__| (_) | | | | | |
|_| \_|\__,_|_| |_| |_|\___| (_) \____\___/|_| |_| |_|
On a first name basis with the rest of the world.
Get your <a href="http://www.name.com">domains</a> at Name.com.
Domain Name: stackoverflow.com
Registrar: Name.com LLC
Expiration Date: 2015-12-26 19:18:07
Creation Date: 2003-12-26 19:18:07
Name Servers:
ns1.serverfault.com
ns2.serverfault.com
REGISTRANT CONTACT INFO
Stack Exchange, Inc.
Sysadmin Team
1 Exchange Plaza
Floor 26
New York
NY
10006
US
Phone: +1.2122328280
Email Address: sysadmin-team@stackoverflow.com
ADMINISTRATIVE CONTACT INFO
Stack Exchange, Inc.
Sysadmin Team
1 Exchange Plaza
Floor 26
New York
NY
10006
US
Phone: +1.2122328280
Email Address: sysadmin-team@stackoverflow.com
TECHNICAL CONTACT INFO
Stack Exchange, Inc.
Sysadmin Team
1 Exchange Plaza
Floor 26
New York
NY
10006
US
Phone: +1.2122328280
Email Address: sysadmin-team@stackoverflow.com
BILLING CONTACT INFO
Stack Exchange, Inc.
Sysadmin Team
1 Exchange Plaza
Floor 26
New York
NY
10006
US
Phone: +1.2122328280
Email Address: sysadmin-team@stackoverflow.com
Timestamp: 1383039360.9081
The Data in the Name.com LLC WHOIS database is provided by Name.com LLC for information purposes, and to assist persons in obtaining information about or related to a domain name registration record. Name.com LLC does not guarantee its accuracy. By submitting a WHOIS query, you agree that you will use this Data only for lawful purposes and that, under no circumstances will you use this Data to: (1) allow, enable, or otherwise support the transmission of mass unsolicited, commercial advertising or solicitations via e-mail (spam); or (2) enable high volume, automated, electronic processes that apply to Name.com LLC (or its systems). Name.com LLC reserves the right to modify these terms at any time. By submitting this query, you agree to abide by this policy.
Cached on: 2013-10-29T03:36:00-06:00
【讨论】：
WebClient 使用 http，而不是 whois 协议。这就像要求使用 ftp 查询 http 资源或使用 ICMP 查询 ftp 资源。您当然可以使用WebClient 来查询whois 代理服务器，但是您依赖于单个网站及其对单个服务提供商的具体实现，因此您真的不应该这样做。一个简单的TcpClient 有什么问题？