DNS/TCP/facebook.comについて、ここに記述してください。
$ dig z-p42-instagram.c10r.facebook.com. @a.gtld-servers.net ; <<>> DiG 9.12.1 <<>> z-p42-instagram.c10r.facebook.com. @a.gtld-servers.net ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 62065 ;; flags: qr rd; QUERY: 1, ANSWER: 0, AUTHORITY: 2, ADDITIONAL: 5 ;; WARNING: recursion requested but not available ;; OPT PSEUDOSECTION: ; EDNS: version: 0, flags:; udp: 4096 ;; QUESTION SECTION: ;z-p42-instagram.c10r.facebook.com. IN A ;; AUTHORITY SECTION: facebook.com. 172800 IN NS a.ns.facebook.com. facebook.com. 172800 IN NS b.ns.facebook.com. ;; ADDITIONAL SECTION: a.ns.facebook.com. 172800 IN AAAA 2a03:2880:fffe:c:face:b00c:0:35 a.ns.facebook.com. 172800 IN A 69.171.239.12 b.ns.facebook.com. 172800 IN AAAA 2a03:2880:ffff:c:face:b00c:0:35 b.ns.facebook.com. 172800 IN A 69.171.255.12 ;; Query time: 166 msec ;; SERVER: 192.5.6.30#53(192.5.6.30) ;; WHEN: Sun Apr 22 13:31:33 JST 2018 ;; MSG SIZE rcvd: 185
$ dig z-p42-instagram.c10r.facebook.com. @a.ns.facebook.com ; <<>> DiG 9.12.1 <<>> z-p42-instagram.c10r.facebook.com. @a.ns.facebook.com ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 46010 ;; flags: qr rd; QUERY: 1, ANSWER: 0, AUTHORITY: 2, ADDITIONAL: 5 ;; WARNING: recursion requested but not available ;; OPT PSEUDOSECTION: ; EDNS: version: 0, flags:; udp: 512 ;; QUESTION SECTION: ;z-p42-instagram.c10r.facebook.com. IN A ;; AUTHORITY SECTION: c10r.facebook.com. 3600 IN NS a.ns.c10r.facebook.com. c10r.facebook.com. 3600 IN NS b.ns.c10r.facebook.com. ;; ADDITIONAL SECTION: a.ns.c10r.facebook.com. 3600 IN AAAA 2a03:2880:fffe:b:face:b00c:0:99 a.ns.c10r.facebook.com. 3600 IN A 69.171.239.11 b.ns.c10r.facebook.com. 3600 IN AAAA 2a03:2880:ffff:b:face:b00c:0:99 b.ns.c10r.facebook.com. 3600 IN A 69.171.255.11 ;; Query time: 34 msec ;; SERVER: 69.171.239.12#53(69.171.239.12) ;; WHEN: Sun Apr 22 13:32:09 JST 2018 ;; MSG SIZE rcvd: 185
$ dig z-p42-instagram.c10r.facebook.com. @69.171.239.11 ; <<>> DiG 9.12.1 <<>> z-p42-instagram.c10r.facebook.com. @69.171.239.11 ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 32511 ;; flags: qr aa rd; QUERY: 1, ANSWER: 1, AUTHORITY: 2, ADDITIONAL: 5 ;; WARNING: recursion requested but not available ;; OPT PSEUDOSECTION: ; EDNS: version: 0, flags:; udp: 512 ;; QUESTION SECTION: ;z-p42-instagram.c10r.facebook.com. IN A ;; ANSWER SECTION: z-p42-instagram.c10r.facebook.com. 60 IN A 31.13.82.174 ;; AUTHORITY SECTION: c10r.facebook.com. 3600 IN NS a.ns.c10r.facebook.com. c10r.facebook.com. 3600 IN NS b.ns.c10r.facebook.com. ;; ADDITIONAL SECTION: a.ns.c10r.facebook.com. 3600 IN AAAA 2a03:2880:fffe:b:face:b00c:0:99 a.ns.c10r.facebook.com. 3600 IN A 69.171.239.11 b.ns.c10r.facebook.com. 3600 IN AAAA 2a03:2880:ffff:b:face:b00c:0:99 b.ns.c10r.facebook.com. 3600 IN A 69.171.255.11 ;; Query time: 34 msec ;; SERVER: 69.171.239.11#53(69.171.239.11) ;; WHEN: Sun Apr 22 13:33:28 JST 2018 ;; MSG SIZE rcvd: 201