shell:$ nslookup -timeout=2 -retry=1 'www.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:
www.baidu.com canonical name = www.a.shifen.com.
www.a.shifen.com canonical name = www.wshifen.com.
Name: www.wshifen.com
Address: 103.235.46.102
Name: www.wshifen.com
Address: 103.235.46.115
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