Operating Systems

DNS server ip adresses Free Fast Public DNS Servers List

Posted on by coder

The most basic task of DNS is to translate hostnames such as theos.in to IP address such as 74.86.49.131. In very simple terms, it can be compared to a phone book. DNS also has other important use such as email routing.

This is my list of better, fast public dns servers and free dns server (as compare to your ISP / DSL / ADSL / cable DNS service providers dns servers). These dns servers are free to all. I was able to improve my browsing speed with following DNS servers. Use any one of the following provider.

Free Public DNS Server

=> Service provider: Google
Google public dns server IP address:

  • 8.8.8.8
  • 8.8.4.4

=> Service provider:Dnsadvantage
Dnsadvantage free dns server list:

  • 156.154.70.1
  • 156.154.71.1

=> Service provider:OpenDNS
OpenDNS free dns server list / IP address:

  • 208.67.222.222
  • 208.67.220.220

=> Service provider:Norton
Norton free dns server list / IP address:

  • 198.153.192.1
  • 198.153.194.1

=> Service provider: GTEI DNS (now Verizon)
Public Name server IP address:

  • 4.2.2.1
  • 4.2.2.2
  • 4.2.2.3
  • 4.2.2.4
  • 4.2.2.5
  • 4.2.2.6

=> Service provider: ScrubIt
Public dns server address:

  • 67.138.54.100
  • 207.225.209.66

What is ‘the system ?

Posted on by coder

In system administration, the word system is used to refer both to the operating  system of a computer and often, collectively(toplu olarak) the set of all computers that cooperate  in a network. If we look at computer systems analytically, we would speak more precisely about human–computer systems:

Definition 1 (human–computer system). An organized collaboration between
humans and computers to solve a problem or provide a service. Although computers
are deterministic, humans are non-deterministic, so human–computer systems
are non-deterministic.

          For the machine part, one speaks of operating systems that govern the operation
of computers. The term operating system has no rigorously accepted definition.
Today, it is often thought of as the collection of all programs bundled with a
computer, combining both in a kernel of basic services and utilities for users;
some prefer to use the term more restrictively

 

This section covers some of the most common DNS record types.

Posted on by coder

A record: This record maps an IP Address to a hostname.

www IN A 192.168.1.12

CNAME record: Used to create an alias to an existing A record. You cannot create a CNAME record pointing to another CNAME record.

web IN CNAME www
MX record: Used to define where email should be sent to. Must point to an A record, not a CNAME.

IN MX mail.example.com.
mail IN A 192.168.1.13
NS record: Used to define which servers serve copies of a zone. It must point to an A record, not a CNAME. This is where Primary and Secondary servers are defined.

IN NS ns.example.com.
IN NS ns2.example.com.
ns IN A 192.168.1.10
ns2 IN A 192.168.1.11