shell:$ nslookup -timeout=2 -retry=1 'www.xunlei.com'
;; Got SERVFAIL reply from 75.98.161.224, trying next server
Server:		69.39.86.5
Address:	69.39.86.5#53

Non-authoritative answer:
www.xunlei.com	canonical name = www.xunlei.com.d1b7f386.cdnhwcxcy07.com.
www.xunlei.com.d1b7f386.cdnhwcxcy07.com	canonical name = hcdnw101.vip.ipv6.cdnhwcbzj102.com.
Name:	hcdnw101.vip.ipv6.cdnhwcbzj102.com
Address: 218.12.76.165
Name:	hcdnw101.vip.ipv6.cdnhwcbzj102.com
Address: 120.233.178.92
Name:	hcdnw101.vip.ipv6.cdnhwcbzj102.com
Address: 36.41.168.165
Name:	hcdnw101.vip.ipv6.cdnhwcbzj102.com
Address: 120.233.178.91
Name:	hcdnw101.vip.ipv6.cdnhwcbzj102.com
Address: 36.41.168.171
Name:	hcdnw101.vip.ipv6.cdnhwcbzj102.com
Address: 221.194.141.163
Name:	hcdnw101.vip.ipv6.cdnhwcbzj102.com
Address: 221.194.141.170
;; communications error to 75.98.161.224#53: timed out