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====== 检测网站可用IP地址（ipv4/ipv6） ======

以 google.com 为例

注：如果nsloolup、dig命令无法使用，可尝试以下命令进行安装
  apt install dnsutils

==== 查询网站的ipv4地址 ====

  nslookup google.com
返回结果如下
<code>
Server:		208.67.222.222
Address:	208.67.222.222#53

Non-authoritative answer:
Name:	google.com
Address: 216.58.192.206
</code>

==== 查询网站的ipv6地址 ====

**方法1：**
  host -t AAAA www.google.com
返回结果如下
  www.google.com has IPv6 address 2607:f8b0:4009:800::2004

**方法2：**
  dig www.google.com AAAA
返回结果如下
<code>
; <<>> DiG 9.10.3-P4-Ubuntu <<>> www.google.com AAAA
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 38692
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 4096
;; QUESTION SECTION:
;www.google.com.			IN	AAAA

;; ANSWER SECTION:
www.google.com.		116	IN	AAAA	2607:f8b0:4009:800::2004

;; Query time: 1 msec
;; SERVER: 208.67.222.222#53(208.67.222.222)
;; WHEN: Tue Oct 08 13:26:03 UTC 2019
;; MSG SIZE  rcvd: 71
</code>

**方法3：**
  nslookup -query=AAAA google.com
返回结果如下:
<code>
Server:		208.67.222.222
Address:	208.67.222.222#53

Non-authoritative answer:
google.com	has AAAA address 2607:f8b0:4009:80e::200e
</code>

参考
  - [[https://docs.oracle.com/cd/E19683-01/817-0573/solimptasks-151/index.html|Example—Using nslookup to Display IPv6 Information]]
  - [[https://zybuluo.com/jings/note/59311|如何获得可用的谷歌IP]]