Comodo Secure DNS（科莫多提供） 8.26.56.26/8.20.247.20 查询速度非常快，一点也不输给dnspod的119.29.29.29 114DNS：114.114.114.114 阿里DNS：223.5.5.5
测试一下查询速度，Comodo Secure DNS（科莫多提供） 8.26.56.26/8.20.247.20基本在1毫秒到900毫秒，波动很大，但是定位不够准确，广东电信使用了
# time dig @8.26.56.26 www.weibo.com
; <<>> DiG 9.8.2rc1-RedHat-9.8.2-0.62.rc1.el6_9.2 <<>> @8.26.56.26 www.weibo.com
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 16697
;; flags: qr rd ra; QUERY: 1, ANSWER: 2, AUTHORITY: 0, ADDITIONAL: 0
;; QUESTION SECTION:
;www.weibo.com. IN A
;; ANSWER SECTION:
www.weibo.com. 31 IN A 180.149.134.141
www.weibo.com. 31 IN A 180.149.134.142
;; Query time: 1 msec
;; SERVER: 8.26.56.26#53(8.26.56.26)
;; WHEN: Tue Jul 18 17:56:07 2017
;; MSG SIZE rcvd: 63
real 0m0.006s
user 0m0.002s
sys 0m0.002s
# time dig @8.20.247.20 www.weibo.com
; <<>> DiG 9.8.2rc1-RedHat-9.8.2-0.62.rc1.el6_9.2 <<>> @8.20.247.20 www.weibo.com
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 4081
;; flags: qr rd ra; QUERY: 1, ANSWER: 2, AUTHORITY: 0, ADDITIONAL: 0
;; QUESTION SECTION:
;www.weibo.com. IN A
;; ANSWER SECTION:
www.weibo.com. 37 IN A 180.149.134.142
www.weibo.com. 37 IN A 180.149.134.141
;; Query time: 2 msec
;; SERVER: 8.20.247.20#53(8.20.247.20)
;; WHEN: Tue Jul 18 17:56:42 2017
;; MSG SIZE rcvd: 63
real 0m0.006s
user 0m0.000s
sys 0m0.004s
# time dig @8.20.247.20 v.qq.com
; <<>> DiG 9.8.2rc1-RedHat-9.8.2-0.62.rc1.el6_9.2 <<>> @8.20.247.20 v.qq.com
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 12273
;; flags: qr rd ra; QUERY: 1, ANSWER: 17, AUTHORITY: 0, ADDITIONAL: 0
;; QUESTION SECTION:
;v.qq.com. IN A
;; ANSWER SECTION:
v.qq.com. 527 IN CNAME v.tc.qq.com.
v.tc.qq.com. 1072 IN CNAME v.tcdn.qq.com.
v.tcdn.qq.com. 211 IN CNAME p21.tcdn.qq.com.
p21.tcdn.qq.com. 128 IN A 58.216.96.21
p21.tcdn.qq.com. 128 IN A 61.155.220.194
p21.tcdn.qq.com. 128 IN A 58.216.96.19
p21.tcdn.qq.com. 128 IN A 58.216.96.18
p21.tcdn.qq.com. 128 IN A 58.216.6.22
p21.tcdn.qq.com. 128 IN A 58.216.96.17
p21.tcdn.qq.com. 128 IN A 221.228.67.166
p21.tcdn.qq.com. 128 IN A 58.216.96.22
p21.tcdn.qq.com. 128 IN A 221.228.67.167
p21.tcdn.qq.com. 128 IN A 221.228.67.146
p21.tcdn.qq.com. 128 IN A 58.216.96.20
p21.tcdn.qq.com. 128 IN A 58.216.6.21
p21.tcdn.qq.com. 128 IN A 58.216.6.20
p21.tcdn.qq.com. 128 IN A 221.228.67.165
;; Query time: 3 msec
;; SERVER: 8.20.247.20#53(8.20.247.20)
;; WHEN: Tue Jul 18 17:58:29 2017
;; MSG SIZE rcvd: 331
real 0m0.007s
user 0m0.002s
sys 0m0.003s
# time dig @8.26.56.26 v.qq.com
; <<>> DiG 9.8.2rc1-RedHat-9.8.2-0.62.rc1.el6_9.2 <<>> @8.26.56.26 v.qq.com
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 2198
;; flags: qr rd ra; QUERY: 1, ANSWER: 5, AUTHORITY: 0, ADDITIONAL: 0
;; QUESTION SECTION:
;v.qq.com. IN A
;; ANSWER SECTION:
v.qq.com. 132 IN CNAME v.tc.qq.com.
v.tc.qq.com. 1290 IN CNAME v.tcdn.qq.com.
v.tcdn.qq.com. 439 IN CNAME p21.tcdn.qq.com.
p21.tcdn.qq.com. 124 IN A 203.205.158.37
p21.tcdn.qq.com. 124 IN A 203.205.158.38
;; Query time: 289 msec
;; SERVER: 8.26.56.26#53(8.26.56.26)
;; WHEN: Tue Jul 18 18:13:52 2017
;; MSG SIZE rcvd: 116
real 0m0.294s
user 0m0.003s
sys 0m0.001s
[root@2 monitor_video]# time dig @8.26.56.26 v.qq.com
; <<>> DiG 9.8.2rc1-RedHat-9.8.2-0.62.rc1.el6_9.2 <<>> @8.26.56.26 v.qq.com
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 1656
;; flags: qr rd ra; QUERY: 1, ANSWER: 5, AUTHORITY: 0, ADDITIONAL: 0
;; QUESTION SECTION:
;v.qq.com. IN A
;; ANSWER SECTION:
v.qq.com. 127 IN CNAME v.tc.qq.com.
v.tc.qq.com. 2027 IN CNAME v.tcdn.qq.com.
v.tcdn.qq.com. 434 IN CNAME p21.tcdn.qq.com.
p21.tcdn.qq.com. 6 IN A 203.205.158.37
p21.tcdn.qq.com. 6 IN A 203.205.158.38
;; Query time: 992 msec
;; SERVER: 8.26.56.26#53(8.26.56.26)
;; WHEN: Tue Jul 18 18:13:57 2017
;; MSG SIZE rcvd: 116
real 0m2.997s
user 0m0.001s
sys 0m0.003s
看看dnspod dns、也就是腾讯DNS，119.29.29.29，定位很准确，返回广东电信ip，查询速度稳定在10几毫秒
# time dig @119.29.29.29 v.qq.com
; <<>> DiG 9.8.2rc1-RedHat-9.8.2-0.62.rc1.el6_9.2 <<>> @119.29.29.29 v.qq.com
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 9766
;; flags: qr rd ra; QUERY: 1, ANSWER: 19, AUTHORITY: 0, ADDITIONAL: 0
;; QUESTION SECTION:
;v.qq.com. IN A
;; ANSWER SECTION:
v.qq.com. 296 IN CNAME v.tc.qq.com.
v.tc.qq.com. 2309 IN CNAME v.tcdn.qq.com.
v.tcdn.qq.com. 296 IN CNAME p21.tcdn.qq.com.
p21.tcdn.qq.com. 54 IN A 125.94.49.21
p21.tcdn.qq.com. 54 IN A 119.147.33.30
p21.tcdn.qq.com. 54 IN A 119.147.253.19
p21.tcdn.qq.com. 54 IN A 119.147.33.28
p21.tcdn.qq.com. 54 IN A 119.147.253.28
p21.tcdn.qq.com. 54 IN A 119.147.33.29
p21.tcdn.qq.com. 54 IN A 113.105.73.147
p21.tcdn.qq.com. 54 IN A 119.147.227.20
p21.tcdn.qq.com. 54 IN A 119.147.227.22
p21.tcdn.qq.com. 54 IN A 125.94.49.22
p21.tcdn.qq.com. 54 IN A 125.94.49.18
p21.tcdn.qq.com. 54 IN A 113.107.238.105
p21.tcdn.qq.com. 54 IN A 119.147.33.32
p21.tcdn.qq.com. 54 IN A 119.147.227.21
p21.tcdn.qq.com. 54 IN A 119.147.227.18
p21.tcdn.qq.com. 54 IN A 119.147.227.19
;; Query time: 14 msec
;; SERVER: 119.29.29.29#53(119.29.29.29)
;; WHEN: Tue Jul 18 17:59:58 2017
;; MSG SIZE rcvd: 340
real 0m0.018s
user 0m0.001s
sys 0m0.004s
[root@2 monitor_video]# time dig @119.29.29.29 www.weibo.com
; <<>> DiG 9.8.2rc1-RedHat-9.8.2-0.62.rc1.el6_9.2 <<>> @119.29.29.29 www.weibo.com
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 32098
;; flags: qr rd ra; QUERY: 1, ANSWER: 2, AUTHORITY: 0, ADDITIONAL: 0
;; QUESTION SECTION:
;www.weibo.com. IN A
;; ANSWER SECTION:
www.weibo.com. 35 IN A 180.149.134.142
www.weibo.com. 35 IN A 180.149.134.141
;; Query time: 12 msec
;; SERVER: 119.29.29.29#53(119.29.29.29)
;; WHEN: Tue Jul 18 18:00:05 2017
;; MSG SIZE rcvd: 63
real 0m0.016s
user 0m0.000s
看看最早的114DNS，114.114.114.114，返回IP为江苏电信IP不够准确，查询时间也非常快1-2毫秒。
# time dig @114.114.114.114 v.qq.com
; <<>> DiG 9.8.2rc1-RedHat-9.8.2-0.62.rc1.el6_9.2 <<>> @114.114.114.114 v.qq.com
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 8929
;; flags: qr rd ra; QUERY: 1, ANSWER: 17, AUTHORITY: 0, ADDITIONAL: 0
;; QUESTION SECTION:
;v.qq.com. IN A
;; ANSWER SECTION:
v.qq.com. 238 IN CNAME v.tc.qq.com.
v.tc.qq.com. 349 IN CNAME v.tcdn.qq.com.
v.tcdn.qq.com. 322 IN CNAME p21.tcdn.qq.com.
p21.tcdn.qq.com. 32 IN A 58.216.6.20
p21.tcdn.qq.com. 32 IN A 58.216.96.19
p21.tcdn.qq.com. 32 IN A 58.216.96.21
p21.tcdn.qq.com. 32 IN A 221.228.67.165
p21.tcdn.qq.com. 32 IN A 58.216.96.18
p21.tcdn.qq.com. 32 IN A 58.216.96.22
p21.tcdn.qq.com. 32 IN A 61.155.220.194
p21.tcdn.qq.com. 32 IN A 58.216.96.17
p21.tcdn.qq.com. 32 IN A 221.228.67.167
p21.tcdn.qq.com. 32 IN A 58.216.6.22
p21.tcdn.qq.com. 32 IN A 58.216.6.21
p21.tcdn.qq.com. 32 IN A 221.228.67.166
p21.tcdn.qq.com. 32 IN A 221.228.67.146
p21.tcdn.qq.com. 32 IN A 58.216.96.20
;; Query time: 2 msec
;; SERVER: 114.114.114.114#53(114.114.114.114)
;; WHEN: Tue Jul 18 18:01:40 2017
;; MSG SIZE rcvd: 331
real 0m0.006s
user 0m0.004s
sys 0m0.000s
[root@2 monitor_video]# time dig @114.114.114.114 www.weibo.com
; <<>> DiG 9.8.2rc1-RedHat-9.8.2-0.62.rc1.el6_9.2 <<>> @114.114.114.114 www.weibo.com
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 13642
;; flags: qr rd ra; QUERY: 1, ANSWER: 2, AUTHORITY: 0, ADDITIONAL: 0
;; QUESTION SECTION:
;www.weibo.com. IN A
;; ANSWER SECTION:
www.weibo.com. 15 IN A 180.149.134.142
www.weibo.com. 15 IN A 180.149.134.141
;; Query time: 1 msec
;; SERVER: 114.114.114.114#53(114.114.114.114)
;; WHEN: Tue Jul 18 18:01:47 2017
;; MSG SIZE rcvd: 63
real 0m0.006s
user 0m0.002s
sys 0m0.002s
最后我们看看阿里DNS，223.5.5.5 223.6.6.6，首先返回ip有时候是湖南电信有时候是江苏电信，不够准确。查询速度10几毫秒，跟腾讯DNS（DNSPod）差不多。
# time dig @223.5.5.5 www.weibo.com
; <<>> DiG 9.8.2rc1-RedHat-9.8.2-0.62.rc1.el6_9.2 <<>> @223.5.5.5 www.weibo.com
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 31354
;; flags: qr rd ra; QUERY: 1, ANSWER: 2, AUTHORITY: 0, ADDITIONAL: 0
;; QUESTION SECTION:
;www.weibo.com. IN A
;; ANSWER SECTION:
www.weibo.com. 40 IN A 180.149.134.142
www.weibo.com. 40 IN A 180.149.134.141
;; Query time: 13 msec
;; SERVER: 223.5.5.5#53(223.5.5.5)
;; WHEN: Tue Jul 18 18:03:01 2017
;; MSG SIZE rcvd: 63
real 0m0.018s
user 0m0.004s
sys 0m0.001s
[root@2 monitor_video]# time dig @223.5.5.5 v.qq.com
; <<>> DiG 9.8.2rc1-RedHat-9.8.2-0.62.rc1.el6_9.2 <<>> @223.5.5.5 v.qq.com
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 5022
;; flags: qr rd ra; QUERY: 1, ANSWER: 10, AUTHORITY: 0, ADDITIONAL: 0
;; QUESTION SECTION:
;v.qq.com. IN A
;; ANSWER SECTION:
v.qq.com. 168 IN CNAME v.tc.qq.com.
v.tc.qq.com. 168 IN CNAME v.tcdn.qq.com.
v.tcdn.qq.com. 168 IN CNAME p21.tcdn.qq.com.
p21.tcdn.qq.com. 168 IN A 218.75.176.141
p21.tcdn.qq.com. 168 IN A 218.75.176.143
p21.tcdn.qq.com. 168 IN A 218.75.176.144
p21.tcdn.qq.com. 168 IN A 218.75.177.23
p21.tcdn.qq.com. 168 IN A 218.75.177.25
p21.tcdn.qq.com. 168 IN A 218.75.177.24
p21.tcdn.qq.com. 168 IN A 218.75.176.142
;; Query time: 6 msec
;; SERVER: 223.5.5.5#53(223.5.5.5)
;; WHEN: Tue Jul 18 18:03:05 2017
;; MSG SIZE rcvd: 196
real 0m0.010s
user 0m0.000s
sys 0m0.004s
小结：dnspod dns（腾讯DNS）119.29.29.29，查询定位很准确返回广东电信ip，查询速度稳定在10几毫秒，阿里dns、114dns都很快但是返回ip不是本省ip，可能是递归查询的ip节点不够多导致不准确。而Comodo Secure DNS（科莫多提供） 8.26.56.26/8.20.247.20 查询速度有时候最快，但是不稳定有时候几百毫秒，返回ip也不够精准同运营商不同省份，还是不稳定，不推荐。