【开发工具】DNS常用命令

判断某个DNS是否可用

命令

nslookup www.baidu.com 218.195.0.1

可用：

C:\Users\username>nslookup www.baidu.com 218.195.80.1
服务器:  UnKnown
Address:  218.195.80.1

非权威应答:
名称:    www.a.shifen.com
Addresses:  110.242.68.4
          110.242.68.3
Aliases:  www.baidu.com

不可用：

C:\Users\username>nslookup www.baidu.com 218.195.81.1
DNS request timed out.
    timeout was 2 seconds.
服务器:  UnKnown
Address:  218.195.81.1

DNS request timed out.
    timeout was 2 seconds.
DNS request timed out.
    timeout was 2 seconds.
DNS request timed out.
    timeout was 2 seconds.
DNS request timed out.
    timeout was 2 seconds.
*** 请求 UnKnown 超时

刷新DNS

命令：

ipconfig /flushdns

运行结果：

C:\Users\lpruoyu>ipconfig /flushdns

Windows IP 配置

已成功刷新 DNS 解析缓存。