mirrors.aliyun.com mirrors.cloud.aliyuncs.com

域名解析的结果可以通过 dig 和 nslookup 来获取，在 CentOS 中命令来源于 bind-utils 工具

安装命令

yum -y install bind-utils 

域名获取 IP 的命令

dig mirrors.aliyun.com

; <<>> DiG 9.10.6 <<>> mirrors.aliyun.com
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 34360
;; flags: qr rd ra; QUERY: 1, ANSWER: 9, AUTHORITY: 0, ADDITIONAL: 0

;; QUESTION SECTION:
;mirrors.aliyun.com.		IN	A

;; ANSWER SECTION:
mirrors.aliyun.com.	12	IN	CNAME	mirrors.aliyun.com.w.alikunlun.com.
mirrors.aliyun.com.w.alikunlun.com. 12 IN A	221.6.157.199
mirrors.aliyun.com.w.alikunlun.com. 12 IN A	221.6.157.201
mirrors.aliyun.com.w.alikunlun.com. 12 IN A	221.6.157.200
mirrors.aliyun.com.w.alikunlun.com. 12 IN A	221.6.157.203
mirrors.aliyun.com.w.alikunlun.com. 12 IN A	221.6.157.196
mirrors.aliyun.com.w.alikunlun.com. 12 IN A	221.6.157.202
mirrors.aliyun.com.w.alikunlun.com. 12 IN A	221.6.157.197
mirrors.aliyun.com.w.alikunlun.com. 12 IN A	221.6.157.198

;; Query time: 4 msec
;; SERVER: 192.168.8.1#53(192.168.8.1)
;; WHEN: Sun Aug 15 23:35:57 CST 2021
;; MSG SIZE  rcvd: 209

但是，mirrors 域名目前阿里云已经迁移到 https://developer.aliyun.com/ 了，所有web访问都会自动跳转到该新域名，因此新域名也需要获取到IP

dig developer.aliyun.com

; <<>> DiG 9.10.6 <<>> developer.aliyun.com
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 59313
;; flags: qr rd ra; QUERY: 1, ANSWER: 4, AUTHORITY: 0, ADDITIONAL: 0

;; QUESTION SECTION:
;developer.aliyun.com.		IN	A

;; ANSWER SECTION:
developer.aliyun.com.	24	IN	CNAME	sh.wagbridge.aliyun.aliyun.com.
sh.wagbridge.aliyun.aliyun.com.	198 IN	CNAME	aliyun-adns.aliyun.com.
aliyun-adns.aliyun.com.	198	IN	CNAME	aliyun-adns.aliyun.com.gds.alibabadns.com.
aliyun-adns.aliyun.com.gds.alibabadns.com. 198 IN A 106.11.172.51

;; Query time: 2179 msec
;; SERVER: 192.168.8.1#53(192.168.8.1)
;; WHEN: Sun Aug 15 23:38:44 CST 2021
;; MSG SIZE  rcvd: 166

对于 mirrors.cloud.aliyuncs.com 域名是阿里云内网的服务域名，在公网是无法直接访问的。

如果贵公司搭建了专线是可以访问的，获取对应 IP 地址的方式和上述步骤类似