shell:$ nslookup -timeout=2 -retry=1 'pan.baidu.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:
pan.baidu.com	canonical name = yiyun.n.shifen.com.
yiyun.n.shifen.com	canonical name = yiyun.wshifen.com.
yiyun.wshifen.com	canonical name = global-nginx-proxy.baidu.com.
Name:	global-nginx-proxy.baidu.com
Address: 34.8.119.41
Name:	global-nginx-proxy.baidu.com
Address: 2600:1901:0:e429::