[System.Net.Dns] :: GetHostEntry方法将IP解析为HOSTNAME而没有PTR记录？ [英] [System.Net.Dns]::GetHostEntry method resolves IP to HOSTNAME without PTR record?

问题描述

我正在尝试使用 Dns.GetHostEntry 方法从DNS服务器获取给定IP的HOSTNAME。

I am trying to use Dns.GetHostEntry method to get the HOSTNAME for a given IP from the DNS server.

根据文档，该方法首先尝试对IP地址进行反向查找。在我的情况下，当我使用 Dns.GetHostEntry 。

According to the documentation, the method first tries to do a reverse lookup on the IP address. In my case this is always successful when I use Dns.GetHostEntry.

现在，奇怪的是，同样的IP nslookup不给我任何东西。它会超时或给我错误： UnKnown找不到10.4.202.16：不存在的域。当我查看DNS服务器（2008 R2）时，在反向查找区域中找不到任何PTR记录。所以nslookup失败的事实并不让我感到惊讶。

Now, the strange thing is that for the same IP nslookup doesn't give me anything. It either times out or gives me error: UnKnown can't find 10.4.202.16: Non-existent domain. When I look into the DNS server (2008 R2), I can not find any PTR records in de reverse lookup zone. So the fact that nslookup fails doesn't surprise me much.

但是这里发生了什么？

But what is going on here? Is Dns.GetHostEntry using some undocumented ways to obtain the HOSTNAME?

推荐答案

>那些metods有错误： http://blog.tyang.org/2011/04/15/problem-with-dns-name-resolution-when-using-system-net-dns-class/ 我建议使用上面的解决方案5。

Those metods have bugs: http://blog.tyang.org/2011/04/15/problem-with-dns-name-resolution-when-using-system-net-dns-class/ I suggest to use Solution 5 from above post.

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