不能PING通的网站,怎么得到他的IP?

[zxd1981]

比如www.sohu.com,PING不通.但用DOS命令仍然能得到IP
而用IdIcmpClient1控件的AReplyStatus.FromIpAddress只能得到能PING通的网站的IP.
怎么实现才能得到www.sohu.com的IP?

[getit911]

DNS解析

[zxd1981]

具体点，行不？

[todouwang]

比如www.sohu.com,PING不通.但用DOS命令仍然能得到IP
我觉得ping不通，其它命令是得不到ip的

我试了下，还真能得到，我用nbtstat -r

[todouwang]

查ip用-c

[jadeluo]

比如www.sohu.com,PING不通.但用DOS命令仍然能得到IP
我觉得ping不通，其它命令是得不到ip的


PING不通，是因为与那个IP绑定的设备(可能是台防火墙)将ICMP包给屏蔽了，PING命令发过去的ICMP包得不到返回包，显示的结果就是PING不通。

而一个域名(比如www.sohu.com)所对应的IP地址是通过DNS服务来查询的，它与PING通不通无关。

另外，在PING程序中，其实是先通过DNS服务将域名转换成IP后，才向这个IP发送ICMP数据包的。也就是说，PING www.sohu.com 和PING 61.135.132.80这两条命令的执行过程是不同的。

[getit911]

到www.2ccc.com下载一个indy的demo程序，里面有个DNSResolver，这是www.sohu.com.cn的结果
========================
Query Result : IP address of www.sohu.com.cn : IP address = 61.135.133.104
IP address = 61.135.133.103
Name Server = ns2.sohu.com
Name Server = dns.sohu.com
Name Server = ns1.sohu.com
IP address = 61.135.131.86
Query Result : IP address of www.sohu.com.cn : IP address = 61.135.133.104
IP address = 61.135.133.103
Name Server = ns2.sohu.com
Name Server = dns.sohu.com
Name Server = ns1.sohu.com
IP address = 61.135.131.86
IP address = 61.135.131.1
IP address = 61.135.132.1

========================

IP address = 61.135.131.1
IP address = 61.135.132.1

========================

[zxd1981]

怎么用DELPHI实现

[ppayun]

ping不通和域名解析没有关系，即使ping不通，也会显示ip地址并显示超时。如果DNS出错，比如ping一个不存在的域名，他会告诉你未知主机的。
C:\Documents and Settings\Administrator>ping www.sohu.com

Pinging pagegrp1.sohu.com [61.135.150.65] with 32 bytes of data:

Request timed out.
Request timed out.
Request timed out.
Request timed out.

Ping statistics for 61.135.150.65:
Packets: Sent = 4, Received = 0, Lost = 4 (100% loss),
Approximate round trip times in milli-seconds:
Minimum = 0ms, Maximum = 0ms, Average = 0ms

C:\Documents and Settings\Administrator>ping wwww.aa.com
Unknown host wwww.aa.com.