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@clarencetw
Created July 27, 2019 15:43
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when-the-website-is-good-or-bad-server-ip-address-not-found-analytical-method
clarence~: dig @8.8.8.8 blog.clarence.tw
; <<>> DiG 9.10.6 <<>> @8.8.8.8 blog.clarence.tw
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 43396
;; flags: qr rd ra; QUERY: 1, ANSWER: 2, AUTHORITY: 0, ADDITIONAL: 1
;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 512
;; QUESTION SECTION:
;blog.clarence.tw. IN A
;; ANSWER SECTION:
blog.clarence.tw. 299 IN A 104.31.80.250
blog.clarence.tw. 299 IN A 104.31.81.250
;; Query time: 35 msec
;; SERVER: 8.8.8.8#53(8.8.8.8)
;; WHEN: Sat Apr 20 00:00:00 CST 2019
;; MSG SIZE rcvd: 77
clarence~: dig @8.8.8.8 blog.clarence.tw
; <<>> DiG 9.10.6 <<>> @8.8.8.8 blog.clarence.tw
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 27880
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 1
;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 512
;; QUESTION SECTION:
;error.clarence.tw. IN A
;; AUTHORITY SECTION:
clarence.tw. 1799 IN SOA graham.ns.cloudflare.com. dns.cloudflare.com. 2030628787 10000 2400 604800 3600
;; Query time: 35 msec
;; SERVER: 8.8.8.8#53(8.8.8.8)
;; WHEN: Sat Apr 20 00:00:00 CST 2019
;; MSG SIZE rcvd: 110
clarence~: dig @8.8.8.8 ns clarence.tw
; <<>> DiG 9.10.6 <<>> @8.8.8.8 ns clarence.tw
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 32983
;; flags: qr rd ra; QUERY: 1, ANSWER: 2, AUTHORITY: 0, ADDITIONAL: 1
;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 512
;; QUESTION SECTION:
;clarence.tw. IN NS
;; ANSWER SECTION:
clarence.tw. 86400 IN NS graham.ns.cloudflare.com.
clarence.tw. 86400 IN NS ulla.ns.cloudflare.com.
;; Query time: 32 msec
;; SERVER: 8.8.8.8#53(8.8.8.8)
;; WHEN: Sat Apr 1 00:00:00 CST 2019
;; MSG SIZE rcvd: 97
clarence~: dig @8.8.8.8 ns google.com
; <<>> DiG 9.10.6 <<>> @8.8.8.8 ns google.com
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 1239
;; flags: qr rd ra; QUERY: 1, ANSWER: 4, AUTHORITY: 0, ADDITIONAL: 1
;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 512
;; QUESTION SECTION:
;google.com. IN NS
;; ANSWER SECTION:
google.com. 21599 IN NS ns2.google.com.
google.com. 21599 IN NS ns4.google.com.
google.com. 21599 IN NS ns1.google.com.
google.com. 21599 IN NS ns3.google.com.
;; Query time: 10 msec
;; SERVER: 8.8.8.8#53(8.8.8.8)
;; WHEN: Sat Apr 20 00:00:00 CST 2019
;; MSG SIZE rcvd: 111
clarence~: dig @graham.ns.cloudflare.com blog.clarence.tw
; <<>> DiG 9.10.6 <<>> @graham.ns.cloudflare.com blog.clarence.tw
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 5440
;; flags: qr aa rd; QUERY: 1, ANSWER: 2, AUTHORITY: 0, ADDITIONAL: 1
;; WARNING: recursion requested but not available
;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 512
;; QUESTION SECTION:
;blog.clarence.tw. IN A
;; ANSWER SECTION:
blog.clarence.tw. 300 IN A 104.31.81.250
blog.clarence.tw. 300 IN A 104.31.80.250
;; Query time: 7 msec
;; SERVER: 173.245.59.171#53(173.245.59.171)
;; WHEN: Sat Apr 20 21:18:10 CST 2019
;; MSG SIZE rcvd: 77
clarence~: dig @ulla.ns.cloudflare.com blog.clarence.tw
; <<>> DiG 9.10.6 <<>> @ulla.ns.cloudflare.com blog.clarence.tw
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 27880
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 1
;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 512
;; QUESTION SECTION:
;error.clarence.tw. IN A
;; AUTHORITY SECTION:
clarence.tw. 1799 IN SOA graham.ns.cloudflare.com. dns.cloudflare.com. 2030628787 10000 2400 604800 3600
;; Query time: 35 msec
;; SERVER: 8.8.8.8#53(8.8.8.8)
;; WHEN: Sat Apr 20 00:00:00 CST 2019
;; MSG SIZE rcvd: 110
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