xvideos服务器找不到,查看域名服务器命令： $ dig -t NS xvideos.com

$ dig -t NS xvideos.com

; <<>> DiG 9.8.3-P1 <<>> -t NS xvideos.com

;; global options: +cmd

;; Got answer:

;; ->>HEADER<

;; flags: qr rd ra; QUERY: 1, ANSWER: 6, AUTHORITY: 0, ADDITIONAL: 0

;; QUESTION SECTION:

;xvideos.com. IN NS

;; ANSWER SECTION:

xvideos.com. 1158 IN NS ns3.randomserver.com.

xvideos.com. 1158 IN NS ns1.randomserver.com.

xvideos.com. 1158 IN NS ns6.randomserver.com.

xvideos.com. 1158 IN NS ns4.randomserver.com.

xvideos.com. 1158 IN NS ns2.randomserver.com.

xvideos.com. 1158 IN NS ns5.randomserver.com.

;; Query time: 62 msec

;; SERVER: 192.168.3.1#53(192.168.3.1)

;; WHEN: Tue Apr 24 03:48:45 2018

;; MSG SIZE rcvd: 150