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Google's free DNS Service 8.8.8.8)

Source: Internet
Author: User
Tags nslookup nxdomain
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Zhou haihan/Wen

Google launched two well-remembered DNS servers after receiving a message from Gu O. That is

 

8.8.8.8

8.8.4.4

Tested and available by myself. Some people say that 4.4.4 and 4.3.2.1 are the same. After my test, the two IP addresses can be pinged but cannot be resolved by DNS.

Below is the test result:

Zhouhh @ zhhofs :~ $ Ping 8.8.8.8
Ping 8.8.8.8 (8.8.8.8) 56 (84) bytes of data.
64 bytes from 8.8.8.8: icmp_seq = 1 TTL = 240 time = 200 MS
64 bytes from 8.8.8.8: icmp_seq = 2 TTL = 240 time = 84.7 MS
^ C
--- 8.8.8.8 Ping statistics ---
2 packets transmitted, 2 bytes ed, 0% packet loss, Time 1000 ms
RTT min/AVG/max/mdev = 84.771/142.731/200.691/57.960 MS

 
Zhouhh @ zhhofs :~ $ Ping 8.8.4.4
Ping 8.8.4.4 (8.8.4.4) 56 (84) bytes of data.
64 bytes from 8.8.4.4: icmp_seq = 1 TTL = 240 time = 111 MS
64 bytes from 8.8.4.4: icmp_seq = 2 TTL = 240 time = 113 MS
^ C
--- 8.8.4.4 Ping statistics ---
2 packets transmitted, 2 bytes ed, 0% packet loss, time 1001 Ms
RTT min/AVG/max/mdev = 111.370/112.358/113.346/0.988 MS

 
Zhouhh @ zhhofs :~ $ Ping 4.3.2.1
Ping 4.3.2.1 (4.3.2.1) 56 (84) bytes of data.
64 bytes from 4.3.2.1: icmp_seq = 1 TTL = 240 time = 107 MS
64 bytes from 4.3.2.1: icmp_seq = 2 TTL = 240 time = 102 MS
^ C
--- 4.3.2.1 Ping statistics ---
2 packets transmitted, 2 bytes ed, 0% packet loss, time 1001 Ms
RTT min/AVG/max/mdev = 102.059/104.628/107.198/2.589 MS

Zhouhh @ zhhofs :~ $ NSLookup 8.8.8.8
Server: 8.8.8.8
Address: 8.8.8.8 #53
Non-Authoritative Answer:
8.8.8.8.in-ADDR. Arpa name = google-public-dns-a.google.com.
Authoritative answers can be found from:


Zhouhh @ zhhofs :~ $ NSLookup 8.8.4.4
Server: 8.8.8.8
Address: 8.8.8.8 #53
Non-Authoritative Answer:
4.4.8.8.in-ADDR. Arpa name = google-public-dns-b.google.com.
Authoritative answers can be found from:

Zhouhh @ zhhofs :~ $ NSLookup 4.4.4
Server: 8.8.8.8
Address: 8.8.8.8 #53
** Server can't find 4.4.4.4.in-ADDR. ARPA.: nxdomain

Zhouhh @ zhhofs :~ $ NSLookup 4.3.2.1
Server: 8.8.8.8
Address: 8.8.8.8 #53
** Server can't find 1.2.3.4.in-ADDR. Arpa: servfail


Zhouhh @ zhhofs :~ $ NSLookup 1.2.3.4
Server: 8.8.8.8
Address: 8.8.8.8 #53
** Server can't find 4.3.2.1.in-ADDR. ARPA.: nxdomain

Zhouhh @ zhhofs :~ $ NSLookup
> Server 8.8.8.8
Default Server: 8.8.8.8
Address: 8.8.8.8 #53
> Set type =
> Google.com
Server: 8.8.8.8
Address: 8.8.8.8 #53
Non-Authoritative Answer:
Name: Google.com
Address: 74.125.53.100
Name: Google.com
Address: 74.125.67.100
Name: Google.com
Address: 74.125.45.100
> Sohu.com
Server: 8.8.8.8
Address: 8.8.8.8 #53
Non-Authoritative Answer:
Name: sohu.com
Address: 61.135.181.176
Name: sohu.com
Address: 61.135.181.175
> Server 4.4.4.4
Default Server: 4.4.4.4
Address: 4.4.4.4 #53
> Set type
* ** Invalid option: Type
> Set type =
* ** Invalid option: Type
> Set type =
> Google.com
^ C
Resolution failed, timeout

Zhouhh @ zhh64 :~ $ NSLookup
> Server 4.3.2.1
Default Server: 4.3.2.1
Address: 4.3.2.1 #53
> Sohu.com
Server: 4.3.2.1
Address: 4.3.2.1 #53

Non-Authoritative Answer:
Name: sohu.com
Address: 61.135.181.176
Name: sohu.com
Address: 61.135.181.175
> Set type
* ** Invalid option: Type
> Set type =
* ** Invalid option: Type
> Set type =
> Sohu.com
Server: 4.3.2.1
Address: 4.3.2.1 #53

Non-Authoritative Answer:
Name: sohu.com
Address: 61.135.181.175
Name: sohu.com
Address: 61.135.181.176
> Server 4.4.4.4
Default Server: 4.4.4.4
Address: 4.4.4.4 #53
> Set type =
> Sohu.com
^ C
4.4.4.4 and 4.3.2.1 fail.
Zhouhh @ zhhofs :~ $ Ping 8.8.8.8
Ping 8.8.8.8 (8.8.8.8) 56 (84) bytes of data.
64 bytes from 8.8.8.8: icmp_seq = 1 TTL = 240 time = 200 MS
64 bytes from 8.8.8.8: icmp_seq = 2 TTL = 240 time = 84.7 MS
^ C
--- 8.8.8.8 Ping statistics ---
2 packets transmitted, 2 bytes ed, 0% packet loss, Time 1000 ms
RTT min/AVG/max/mdev = 84.771/142.731/200.691/57.960 MS
Zhouhh @ zhhofs :~ $ Ping 8.8.4.4
Ping 8.8.4.4 (8.8.4.4) 56 (84) bytes of data.
64 bytes from 8.8.4.4: icmp_seq = 1 TTL = 240 time = 111 MS
64 bytes from 8.8.4.4: icmp_seq = 2 TTL = 240 time = 113 MS
^ C
--- 8.8.4.4 Ping statistics ---
2 packets transmitted, 2 bytes ed, 0% packet loss, time 1001 Ms
RTT min/AVG/max/mdev = 111.370/112.358/113.346/0.988 MS
Zhouhh @ zhhofs :~ $ Ping 4.3.2.1
Ping 4.3.2.1 (4.3.2.1) 56 (84) bytes of data.
64 bytes from 4.3.2.1: icmp_seq = 1 TTL = 240 time = 107 MS
64 bytes from 4.3.2.1: icmp_seq = 2 TTL = 240 time = 102 MS
^ C
--- 4.3.2.1 Ping statistics ---
2 packets transmitted, 2 bytes ed, 0% packet loss, time 1001 Ms
RTT min/AVG/max/mdev = 102.059/104.628/107.198/2.589 MS
Zhouhh @ zhhofs :~ $ NSLookup 8.8.8.8
Server: 8.8.8.8
Address: 8.8.8.8 #53
Non-Authoritative Answer:
8.8.8.8.in-ADDR. Arpa name = google-public-dns-a.google.com.
Authoritative answers can be found from:
Zhouhh @ zhhofs :~ $ NSLookup 8.8.4.4
Server: 8.8.8.8
Address: 8.8.8.8 #53
Non-Authoritative Answer:
4.4.8.8.in-ADDR. Arpa name = google-public-dns-b.google.com.
Authoritative answers can be found from:
Zhouhh @ zhhofs :~ $ NSLookup 4.4.4
Server: 8.8.8.8
Address: 8.8.8.8 #53
** Server can't find 4.4.4.4.in-ADDR. ARPA.: nxdomain
Zhouhh @ zhhofs :~ $ NSLookup 4.3.2.1
Server: 8.8.8.8
Address: 8.8.8.8 #53
** Server can't find 1.2.3.4.in-ADDR. Arpa: servfail
Zhouhh @ zhhofs :~ $ NSLookup 1.2.3.4
Server: 8.8.8.8
Address: 8.8.8.8 #53
** Server can't find 4.3.2.1.in-ADDR. ARPA.: nxdomain
Zhouhh @ zhhofs :~ $ NSLookup
> Server 8.8.8.8
Default Server: 8.8.8.8
Address: 8.8.8.8 #53
> Set type =
> Google.com
Server: 8.8.8.8
Address: 8.8.8.8 #53
Non-Authoritative Answer:
Name: Google.com
Address: 74.125.53.100
Name: Google.com
Address: 74.125.67.100
Name: Google.com
Address: 74.125.45.100
> Sohu.com
Server: 8.8.8.8
Address: 8.8.8.8 #53
Non-Authoritative Answer:
Name: sohu.com
Address: 61.135.181.176
Name: sohu.com
Address: 61.135.181.175
> Server 4.4.4.4
Default Server: 4.4.4.4
Address: 4.4.4.4 #53
> Set type
* ** Invalid option: Type
> Set type =
* ** Invalid option: Type
> Set type =
> Google.com
^ C
Resolution failed, timeout

Zhouhh @ zhh64 :~ $ NSLookup
> Server 4.3.2.1
Default Server: 4.3.2.1
Address: 4.3.2.1 #53
> Sohu.com
Server: 4.3.2.1
Address: 4.3.2.1 #53

Non-Authoritative Answer:
Name: sohu.com
Address: 61.135.181.176
Name: sohu.com
Address: 61.135.181.175
> Set type
* ** Invalid option: Type
> Set type =
* ** Invalid option: Type
> Set type =
> Sohu.com
Server: 4.3.2.1
Address: 4.3.2.1 #53

Non-Authoritative Answer:
Name: sohu.com
Address: 61.135.181.175
Name: sohu.com
Address: 61.135.181.176
> Server 4.4.4.4
Default Server: 4.4.4.4
Address: 4.4.4.4 #53
> Set type =
> Sohu.com
^ C
4.4.4.4 and 4.3.2.1 fail.

8.8.8.8 and 8.8.4.4 are available.

After additional tests, 4.3.2.1 is available.

8.8.8.8, 8.8.4.4, and 4.3.2.1 do not worry about Domain Name kidnapping. However, 8.8.8.8, 8.8.4.4, and 4.3.2.1 may be banned by gFW.

PS: One night later, I solved the network problem for a girl, assigned an IP address, and assigned 8.8.8.8 to the DNS. As a result, she asked, "you just need to configure one DNS, right ?" 8.8.8.8 it's so easy to remember that we don't believe it.
This article from the csdn blog, reproduced please indicate the source: http://blog.csdn.net/ablo_zhou/archive/2009/12/08/4964658.aspx

This article is an English version of an article which is originally in the Chinese language on aliyun.com and is provided for information purposes only. This website makes no representation or warranty of any kind, either expressed or implied, as to the accuracy, completeness ownership or reliability of the article or any translations thereof. If you have any concerns or complaints relating to the article, please send an email, providing a detailed description of the concern or complaint, to info-contact@alibabacloud.com. A staff member will contact you within 5 working days. Once verified, infringing content will be removed immediately.

Related Keywords:
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