watchWWW/cisco.comについて、ここに記述してください。
1. 古い設定か
http://www.cisco.com.ipaddress.com/
IP Address of Cisco is 95.100.176.188 Hostname: www.cisco.com IP Address: 95.100.176.188 Host of this IP: a95-100-176-188.deploy.akamaitechnologies.com Organization: Akamai Technologies ISP: Akamai Technologies Updated: 03/14/2016 07:55 PM
2. 最近の調査
$ dnsq soa cisco.com a.gtld-servers.net
6 cisco.com: 213 bytes, 1+0+3+6 records, response, noerror query: 6 cisco.com authority: cisco.com 172800 NS ns1.cisco.com authority: cisco.com 172800 NS ns2.cisco.com authority: cisco.com 172800 NS ns3.cisco.com additional: ns1.cisco.com 172800 28 \040\001\004\040\021\001\000\006\000\000\000\000\000\000\000\012 additional: ns1.cisco.com 172800 A 72.163.5.201 additional: ns2.cisco.com 172800 28 \040\001\004\040\040AP\000\000\000\000\000\000\000\000\012 additional: ns2.cisco.com 172800 A 64.102.255.44 additional: ns3.cisco.com 172800 A 173.37.146.41 additional: ns3.cisco.com 172800 28 \040\001\004\040\022\001\000\007\000\000\000\000\000\000\000\012
$ dnsq soa cisco.com 64.102.255.44 6 cisco.com: 274 bytes, 1+1+3+6 records, response, authoritative, noerror query: 6 cisco.com answer: cisco.com 86400 SOA edns-aln1-1-l.cisco.com postmaster.cisco.com 16034765 7200 1800 864000 86400 authority: cisco.com 86400 NS ns2.cisco.com authority: cisco.com 86400 NS ns3.cisco.com authority: cisco.com 86400 NS ns1.cisco.com additional: ns1.cisco.com 600 A 72.163.5.201 additional: ns1.cisco.com 86400 28 \040\001\004\040\021\001\000\006\000\000\000\000\000\000\000\012 additional: ns2.cisco.com 86400 A 64.102.255.44 additional: ns2.cisco.com 86400 28 \040\001\004\040\040AP\000\000\000\000\000\000\000\000\012 additional: ns3.cisco.com 86400 A 173.37.146.41 additional: ns3.cisco.com 86400 28 \040\001\004\040\022\001\000\007\000\000\000\000\000\000\000\012
$ dnsq a www.cisco.com 64.102.255.44 1 www.cisco.com: 69 bytes, 1+1+0+0 records, response, authoritative, noerror query: 1 www.cisco.com answer: www.cisco.com 3600 CNAME www.cisco.com.akadns.net
/akadns.net の詳細
$ dnsq a www.cisco.com.akadns.net a3-129.akadns.net 1 www.cisco.com.akadns.net: 80 bytes, 1+1+0+0 records, response, authoritative, noerror query: 1 www.cisco.com.akadns.net answer: www.cisco.com.akadns.net 300 CNAME wwwds.cisco.com.edgekey.net
3. nxdomain返答!
$ dnsq a com.akadns.net a3-129.akadns.net
1 com.akadns.net: 98 bytes, 1+0+1+0 records, response, authoritative, nxdomain query: 1 com.akadns.net authority: akadns.net 180 SOA internal.akadns.net hostmaster.akamai.com 1458427663 90000 90000 90000 180
念のためゾーンサーバを確認しておく。
$ dnsq a www.cisco.com.akadns.net a.gtld-servers.net
1 www.cisco.com.akadns.net: 346 bytes, 1+0+10+5 records, response, noerror query: 1 www.cisco.com.akadns.net authority: akadns.net 172800 NS a3-129.akadns.net authority: akadns.net 172800 NS a7-131.akadns.net authority: akadns.net 172800 NS a11-129.akadns.net authority: akadns.net 172800 NS a1-128.akadns.net authority: akadns.net 172800 NS a9-128.akadns.net authority: akadns.net 172800 NS a5-130.akadns.org authority: akadns.net 172800 NS a13-130.akadns.org authority: akadns.net 172800 NS a4-131.akadns.org authority: akadns.net 172800 NS a10-128.akadns.org authority: akadns.net 172800 NS a28-129.akadns.org additional: a3-129.akadns.net 172800 A 96.7.49.129 additional: a7-131.akadns.net 172800 A 23.61.199.131 additional: a11-129.akadns.net 172800 A 84.53.139.129 additional: a1-128.akadns.net 172800 A 193.108.88.128 additional: a9-128.akadns.net 172800 A 184.85.248.128