; <<>> DiG 9.11.4-P2-RedHat-9.11.4-9.P2.el7 <<>> baidu.com +trace ;; global options: +cmd . 5 IN NS g.root-servers.net. . 5 IN NS a.root-servers.net. . 5 IN NS h.root-servers.net. . 5 IN NS f.root-servers.net. . 5 IN NS k.root-servers.net. . 5 IN NS j.root-servers.net. . 5 IN NS e.root-servers.net. . 5 IN NS i.root-servers.net. . 5 IN NS d.root-servers.net. . 5 IN NS m.root-servers.net. . 5 IN NS c.root-servers.net. . 5 IN NS b.root-servers.net. . 5 IN NS l.root-servers.net. ;; Received 239 bytes from 192.168.142.2#53(192.168.142.2) in 4047 ms
2、返回com.顶级域名服务器信息
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
com. 172800 IN NS e.gtld-servers.net. com. 172800 IN NS c.gtld-servers.net. com. 172800 IN NS i.gtld-servers.net. com. 172800 IN NS f.gtld-servers.net. com. 172800 IN NS k.gtld-servers.net. com. 172800 IN NS j.gtld-servers.net. com. 172800 IN NS m.gtld-servers.net. com. 172800 IN NS l.gtld-servers.net. com. 172800 IN NS g.gtld-servers.net. com. 172800 IN NS b.gtld-servers.net. com. 172800 IN NS d.gtld-servers.net. com. 172800 IN NS h.gtld-servers.net. com. 172800 IN NS a.gtld-servers.net. com. 86400 IN DS 30909 8 2 E2D3C916F6DEEAC73294E8268FB5885044A833FC5459588F4A9184CF C41A5766 com. 86400 IN RRSIG DS 8 1 86400 20210226050000 20210213040000 42351 . sKLysaJvml4IZAj8fgWq+Kx5mNwc/K7vEzqlyRqT1xqQqMLajvy4N+cB 4yEK4P7tRZmus5iJ2n1F8ejG90NonpdxrZMZM5XoiqktGHSUt4cA+9bh 5Howi3VOBE94BEyuPOC7S0PZIO41J8kCASOlQRKwn/JgDJ3fxwM3JJU7 hn8OmZ4cQwI8GuBNf2rrdzr7JaywDTAHGPleTR+aHpxbKN/pIQwQqQN4 cv8OaDY1wxonAuDaFrAUKW4Gl3ekNmFKvmo5a2jybDF+wu14NwRX57Ho hAefWTraAeqQLdm1JJ5IM0B+wokDqpOyZG/9hCBPklqhWL8USLeWr//c uUzkig== ;; Received 1169 bytes from 202.12.27.33#53(m.root-servers.net) in 133 ms
3、返回baidu.com.域服务器信息
1 2 3 4 5 6 7 8 9 10
baidu.com. 172800 IN NS ns2.baidu.com. baidu.com. 172800 IN NS ns3.baidu.com. baidu.com. 172800 IN NS ns4.baidu.com. baidu.com. 172800 IN NS ns1.baidu.com. baidu.com. 172800 IN NS ns7.baidu.com. CK0POJMG874LJREF7EFN8430QVIT8BSM.com. 86400 IN NSEC3 1 1 0 - CK0Q1GIN43N1ARRC9OSM6QPQR81H5M9A NS SOA RRSIG DNSKEY NSEC3PARAM CK0POJMG874LJREF7EFN8430QVIT8BSM.com. 86400 IN RRSIG NSEC3 8 2 86400 20210217054119 20210210043119 58540 com. FD+n+fO9jI2LoVi9ULqvx6lIp8ZP5yC/0HzfnJqiqgTTubTJiVzoVT29 xai2LSeepPqzS/+sehbGHpqOgj21uJoOLePqmaVx/f73ZGcP6Ud2tlkQ QIE++OwDlcQK6P/BM96xdHmGEnG/RaMrFiHV919Xog+sFZddMpjVTtYR q9nST68IU2gLDcNTFeeM7P3CaUdaSRl3LIRz8iuWMrYNSg== HPVUSBDNI26UDNIV6R0SV14GC3KGR4JP.com. 86400 IN NSEC3 1 1 0 - HPVVN3Q5E5GOQP2QFE2LEM4SVB9C0SJ6 NS DS RRSIG HPVUSBDNI26UDNIV6R0SV14GC3KGR4JP.com. 86400 IN RRSIG NSEC3 8 2 86400 20210217071943 20210210060943 58540 com. N5kC7xBpBiXE1kFHNz0QrRWRsebQhrT+zL+oO8yaR0tRQfIhHR1QMNCl Nf6jGiV+W518OfSN16Ypw54wiKf5esFFNChS0LKgp522CUzp8mYYiI5D c8elJwUrD1mYqzLXTjTQF8v2IK3bi/NwWzCasM3K5YEnP2ihO9aLRATU 3l7MdCQC9kajJ8CzkLtA+JsnK0jTP3YsrClYZmS5jKmz4Q== ;; Received 757 bytes from 192.43.172.30#53(i.gtld-servers.net) in 276 ms
4、最终查到了ip地址
1 2 3 4 5 6 7 8
baidu.com. 600 IN A 39.156.69.79 baidu.com. 600 IN A 220.181.38.148 baidu.com. 86400 IN NS ns3.baidu.com. baidu.com. 86400 IN NS ns7.baidu.com. baidu.com. 86400 IN NS dns.baidu.com. baidu.com. 86400 IN NS ns4.baidu.com. baidu.com. 86400 IN NS ns2.baidu.com. ;; Received 240 bytes from 180.76.76.92#53(ns7.baidu.com) in 22 ms