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

nslookup google.com

返回结果如下

Server:		208.67.222.222
Address:	208.67.222.222#53

Non-authoritative answer:
Name:	google.com
Address: 216.58.192.206

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

; <<>> 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

方法3：

nslookup -query=AAAA google.com

返回结果如下:

Server:		208.67.222.222
Address:	208.67.222.222#53

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

参考

1. Example—Using nslookup to Display IPv6 Information
2. 如何获得可用的谷歌IP