shell:$ nslookup -timeout=2 -retry=1 'at.alicdn.com'
;; communications error to 75.98.161.224#53: timed out
Server:		69.39.86.5
Address:	69.39.86.5#53

Non-authoritative answer:
at.alicdn.com	canonical name = at.alicdn.com.danuoyi.alicdn.com.
Name:	at.alicdn.com.danuoyi.alicdn.com
Address: 163.181.66.200
Name:	at.alicdn.com.danuoyi.alicdn.com
Address: 163.181.66.201