9月7日消息，近日，腾讯旗下DNSPod正式推出了类似google open dns服务，公共域名解析服务Public DNS+，使用同一个服务IP 119.29.29.29，号称安全零劫持。

DNS劫持是一种通过改变指定域名在运营商侧DNS配置的正确解析指向，将该域名的解析结果重定向到劫持IP的劫持行为。DNS劫持类型可大致分为运营商缓存，广告，恶意劫持等类别。

DNSPod推出的Public DNS+服务号称有安全零劫持、准确不丢包、快速无等待、稳定多容灾的优势。

DNSPod建立于2006年3月份，是中国第一大DNS解析服务提供商、第一大域名托管商，2011年8月8日被腾讯收购，收购完成后，DNSPod保持独立运营。

国内外几家知名的公共DNS:

114dns： 114.114.114.114

阿里： 223.5.5.5.5

百度： 180.76.76.76

360： 101.226.4.6

Google： 8.8.8.8

我们就测试一下这些dns dig的速度如何：

360DNS 101.226.4.6 dig测试
# dig @101.226.4.6 v.qq.com
; <<>> DiG 9.8.2rc1-RedHat-9.8.2-0.37.rc1.el6_7.4 <<>> @101.226.4.6 v.qq.com
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 23722
;; flags: qr rd ra; QUERY: 1, ANSWER: 13, AUTHORITY: 0, ADDITIONAL: 0
;; QUESTION SECTION:
;v.qq.com.                      IN      A
;; ANSWER SECTION:
v.qq.com.               331     IN      CNAME   v.tc.qq.com.
v.tc.qq.com.            3165    IN      CNAME   v.tcdn.qq.com.
v.tcdn.qq.com.          60      IN      CNAME   p21.tcdn.qq.com.
p21.tcdn.qq.com.        161     IN      A       119.147.253.22
p21.tcdn.qq.com.        161     IN      A       119.147.33.32
p21.tcdn.qq.com.        161     IN      A       119.147.253.21
p21.tcdn.qq.com.        161     IN      A       119.147.33.28
p21.tcdn.qq.com.        161     IN      A       119.147.253.20
p21.tcdn.qq.com.        161     IN      A       113.107.238.22
p21.tcdn.qq.com.        161     IN      A       119.147.33.29
p21.tcdn.qq.com.        161     IN      A       119.147.33.31
p21.tcdn.qq.com.        161     IN      A       119.147.33.30
p21.tcdn.qq.com.        161     IN      A       59.57.18.147
;; Query time: 31 msec
;; SERVER: 101.226.4.6#53(101.226.4.6)
;; WHEN: Wed Dec  2 11:50:05 2015
;; MSG SIZE  rcvd: 244

百度DNSdig测试180.76.76.76
# dig @180.76.76.76 v.qq.com
; <<>> DiG 9.8.2rc1-RedHat-9.8.2-0.37.rc1.el6_7.4 <<>> @180.76.76.76 v.qq.com
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 54787
;; flags: qr rd ra; QUERY: 1, ANSWER: 13, AUTHORITY: 0, ADDITIONAL: 0
;; QUESTION SECTION:
;v.qq.com.                      IN      A
;; ANSWER SECTION:
v.qq.com.               488     IN      CNAME   v.tc.qq.com.
v.tc.qq.com.            856     IN      CNAME   v.tcdn.qq.com.
v.tcdn.qq.com.          315     IN      CNAME   p21.tcdn.qq.com.
p21.tcdn.qq.com.        319     IN      A       119.147.33.30
p21.tcdn.qq.com.        319     IN      A       119.147.253.21
p21.tcdn.qq.com.        319     IN      A       119.147.33.29
p21.tcdn.qq.com.        319     IN      A       119.147.33.28
p21.tcdn.qq.com.        319     IN      A       119.147.33.31
p21.tcdn.qq.com.        319     IN      A       119.147.253.22
p21.tcdn.qq.com.        319     IN      A       59.57.18.147
p21.tcdn.qq.com.        319     IN      A       119.147.253.20
p21.tcdn.qq.com.        319     IN      A       113.107.238.22
p21.tcdn.qq.com.        319     IN      A       119.147.33.32
;; Query time: 38 msec
;; SERVER: 180.76.76.76#53(180.76.76.76)
;; WHEN: Wed Dec  2 11:49:34 2015
;; MSG SIZE  rcvd: 244

阿里Open DNS公共DNSdig测试： 223.5.5.5.5
# dig @223.6.6.6 v.qq.com
; <<>> DiG 9.8.2rc1-RedHat-9.8.2-0.37.rc1.el6_7.4 <<>> @223.6.6.6 v.qq.com
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 55386
;; flags: qr rd ra; QUERY: 1, ANSWER: 13, AUTHORITY: 0, ADDITIONAL: 0
;; QUESTION SECTION:
;v.qq.com.                      IN      A
;; ANSWER SECTION:
v.qq.com.               235     IN      CNAME   v.tc.qq.com.
v.tc.qq.com.            235     IN      CNAME   v.tcdn.qq.com.
v.tcdn.qq.com.          235     IN      CNAME   p21.tcdn.qq.com.
p21.tcdn.qq.com.        235     IN      A       119.147.253.20
p21.tcdn.qq.com.        235     IN      A       113.107.238.22
p21.tcdn.qq.com.        235     IN      A       119.147.33.30
p21.tcdn.qq.com.        235     IN      A       59.57.18.147
p21.tcdn.qq.com.        235     IN      A       119.147.33.32
p21.tcdn.qq.com.        235     IN      A       119.147.33.28
p21.tcdn.qq.com.        235     IN      A       119.147.33.29
p21.tcdn.qq.com.        235     IN      A       119.147.253.22
p21.tcdn.qq.com.        235     IN      A       119.147.253.21
p21.tcdn.qq.com.        235     IN      A       119.147.33.31
;; Query time: 5 msec
;; SERVER: 223.6.6.6#53(223.6.6.6)
;; WHEN: Wed Dec  2 11:48:56 2015
;; MSG SIZE  rcvd: 244

腾讯Dnspod openDNS 公共DNS dig测试 119.29.29.29
# dig @119.29.29.29 v.qq.com
; <<>> DiG 9.8.2rc1-RedHat-9.8.2-0.37.rc1.el6_7.4 <<>> @119.29.29.29 v.qq.com
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 63125
;; flags: qr rd ra; QUERY: 1, ANSWER: 13, AUTHORITY: 0, ADDITIONAL: 0
;; QUESTION SECTION:
;v.qq.com.                      IN      A
;; ANSWER SECTION:
v.qq.com.               169     IN      CNAME   v.tc.qq.com.
v.tc.qq.com.            3169    IN      CNAME   v.tcdn.qq.com.
v.tcdn.qq.com.          169     IN      CNAME   p21.tcdn.qq.com.
p21.tcdn.qq.com.        169     IN      A       119.147.33.32
p21.tcdn.qq.com.        169     IN      A       119.147.253.21
p21.tcdn.qq.com.        169     IN      A       113.107.238.22
p21.tcdn.qq.com.        169     IN      A       119.147.33.30
p21.tcdn.qq.com.        169     IN      A       119.147.33.29
p21.tcdn.qq.com.        169     IN      A       59.57.18.147
p21.tcdn.qq.com.        169     IN      A       119.147.33.31
p21.tcdn.qq.com.        169     IN      A       119.147.33.28
p21.tcdn.qq.com.        169     IN      A       119.147.253.20
p21.tcdn.qq.com.        169     IN      A       119.147.253.22
;; Query time: 12 msec
;; SERVER: 119.29.29.29#53(119.29.29.29)
;; WHEN: Wed Dec  2 11:47:43 2015
;; MSG SIZE  rcvd: 244

114dns公共DNS dig测试： 114.114.114.114
# dig @114.114.114.114 v.qq.com
; <<>> DiG 9.8.2rc1-RedHat-9.8.2-0.37.rc1.el6_7.4 <<>> @114.114.114.114 v.qq.com
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 35456
;; flags: qr rd ra; QUERY: 1, ANSWER: 13, AUTHORITY: 0, ADDITIONAL: 0
;; QUESTION SECTION:
;v.qq.com.                      IN      A
;; ANSWER SECTION:
v.qq.com.               172     IN      CNAME   v.tc.qq.com.
v.tc.qq.com.            2611    IN      CNAME   v.tcdn.qq.com.
v.tcdn.qq.com.          539     IN      CNAME   p21.tcdn.qq.com.
p21.tcdn.qq.com.        262     IN      A       113.107.238.22
p21.tcdn.qq.com.        262     IN      A       119.147.33.30
p21.tcdn.qq.com.        262     IN      A       119.147.33.29
p21.tcdn.qq.com.        262     IN      A       119.147.33.31
p21.tcdn.qq.com.        262     IN      A       119.147.33.32
p21.tcdn.qq.com.        262     IN      A       119.147.253.20
p21.tcdn.qq.com.        262     IN      A       119.147.33.28
p21.tcdn.qq.com.        262     IN      A       119.147.253.22
p21.tcdn.qq.com.        262     IN      A       119.147.253.21
p21.tcdn.qq.com.        262     IN      A       59.57.18.147
;; Query time: 27 msec
;; SERVER: 114.114.114.114#53(114.114.114.114)
;; WHEN: Wed Dec  2 11:48:44 2015
;; MSG SIZE  rcvd: 244