DNS/毒盛/CNAME/twimgについて、ここに記述してください。
$ dig +norec -t a pbs\.twimg\.com @ns4\.p34\.dynect\.net.
; <<>> DiG 9.9.5-3ubuntu0.9-Ubuntu <<>> +norec -t a pbs.twimg.com @ns4.p34.dynect.net. ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 47180 ;; flags: qr aa; QUERY: 1, ANSWER: 3, AUTHORITY: 4, ADDITIONAL: 1 ;; OPT PSEUDOSECTION: ; EDNS: version: 0, flags:; udp: 4096 ;; QUESTION SECTION: ;pbs.twimg.com. IN A ;; ANSWER SECTION: pbs.twimg.com. 300 IN CNAME wildcard.twimg.com. wildcard.twimg.com. 1800 IN A 104.244.43.39 wildcard.twimg.com. 1800 IN A 104.244.43.103 ;; AUTHORITY SECTION: twimg.com. 1800 IN NS ns2.p34.dynect.net. twimg.com. 1800 IN NS ns1.p34.dynect.net. twimg.com. 1800 IN NS ns4.p34.dynect.net. twimg.com. 1800 IN NS ns3.p34.dynect.net. ;; Query time: 8 msec ;; SERVER: 204.13.251.34#53(204.13.251.34) ;; WHEN: Tue Nov 01 09:30:31 JST 2016 ;; MSG SIZE rcvd: 183
$ dig +norec -t a pbs\.twimg\.com @ns4\.p34\.dynect\.net.
; <<>> DiG 9.9.5-3ubuntu0.9-Ubuntu <<>> +norec -t a pbs.twimg.com @ns4.p34.dynect.net. ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 11812 ;; flags: qr aa; QUERY: 1, ANSWER: 3, AUTHORITY: 4, ADDITIONAL: 1 ;; OPT PSEUDOSECTION: ; EDNS: version: 0, flags:; udp: 4096 ;; QUESTION SECTION: ;pbs.twimg.com. IN A ;; ANSWER SECTION: pbs.twimg.com. 300 IN CNAME wildcard.twimg.com. wildcard.twimg.com. 1800 IN A 104.244.43.71 wildcard.twimg.com. 1800 IN A 104.244.43.231 ;; AUTHORITY SECTION: twimg.com. 1800 IN NS ns3.p34.dynect.net. twimg.com. 1800 IN NS ns2.p34.dynect.net. twimg.com. 1800 IN NS ns1.p34.dynect.net. twimg.com. 1800 IN NS ns4.p34.dynect.net. ;; Query time: 7 msec ;; SERVER: 204.13.251.34#53(204.13.251.34) ;; WHEN: Tue Nov 01 09:31:00 JST 2016 ;; MSG SIZE rcvd: 183 tmaeno@tm:~$ dig +norec -t a pbs\.twimg\.com @ns4\.p34\.dynect\.net. ; <<>> DiG 9.9.5-3ubuntu0.9-Ubuntu <<>> +norec -t a pbs.twimg.com @ns4.p34.dynect.net. ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 58487 ;; flags: qr aa; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 1 ;; OPT PSEUDOSECTION: ; EDNS: version: 0, flags:; udp: 4096 ;; QUESTION SECTION: ;pbs.twimg.com. IN A ;; ANSWER SECTION: pbs.twimg.com. 300 IN CNAME cs196.wac.edgecastcdn.net. ;; Query time: 121 msec ;; SERVER: 204.13.251.34#53(204.13.251.34) ;; WHEN: Tue Nov 01 09:31:17 JST 2016 ;; MSG SIZE rcvd: 81