→ Best public and free dns servers 【2020】?

What are DNS?

The DNS service means in English Domain Name Server, in Spanish Domain Name System, and is a protocol whose main function is to associate domain names with IP addresses. In this way, it will be responsible for translating names that are intelligible to humans, such as " profesionalreview.com " in the corresponding IP address of the server that contains this domain. In addition, it will be responsible for locating and directing the client with the server worldwide.

DNS servers use a decentralized and hierarchical database where all information about domain names that exist throughout the Internet will be stored. In addition to this simple domain-IP information, other interesting information is also stored, such as the location of email services that each domain has, in this way the data packets that we send through an email will be associated immediately with the domain name and it will be sent.

We can really differentiate between three types of DNS. We briefly summarize it:

User: They are those that the user uses as domain names when requesting a connection to a web page or service and that between them he identifies himself with the registered countries. For example:.es (Spain),.org (Organizations),.edu (education),.info (information), etc… Name resolvers: These are used in software and are responsible for searching in a cache of names. That is, the different programs use when they want to find an IP associated with a name or conversely… a name associated with an IP address. For example, on a server with Debian or Ubuntu it is used as the / etc / hosts resolver and is configured in the files /etc/resolv.conf and /etc/host.conf. Name server: It is in charge of meeting the requests of the resolvers and available from tables where it associates names and IP addresses. These servers can be free or paid.

How a DNS service works on the Internet

The concept as we see is quite simple, it will send a domain name to a server that will transform it into an associated IP address. But the truth is that it is somewhat more complicated in practice.

As a general rule, we do not connect to a DNS server directly, and this is because our own computer and operating system automatically creates a cache where it will store the domain names and associated IPs.

When we type a web address into our browser, it requires a DNS lookup to associate the name with the actual IP address. But the first thing that our system does is check if the answer that the browser is requesting is in the local cache. If it is, it will automatically send the associated IP to establish the remote connection. Only in the case that this information is not saved, the equipment will connect to a DNS server that it finds in its path to request the ISP service. At this time this information will become part of the system cache for future accesses.

As a general rule, normal users use the DNS provided by the Internet service provider as a DNS server. But at any time we can customize the DNS server that will be in charge of performing this service.

DNS hierarchy tree

It will also be important to know the DNS hierarchy that is used in name resolution, since all identifiers do not have the same weight. As we know, when putting a domain name we have different identifiers within them separated by dots.

The structure of domain names is of the inverted tree type. Face sheet represents a label of the domain name that we are going to place. Each tag is a character string in which only numbers, letters and the character “-“ are allowed. Only up to 63 characters per label and a maximum of 255 characters per domain will be allowed, all of which will have to start with a letter. In turn, each tag will be separated by dots, and as a peculiarity, every domain name ends in a dot, although we will never see it because it is omitted.

How can we find out what DNS we have installed on our computer?

In the linux branch we should use the following command (with root permissions):

#cat /etc/resolv.conf

And in windows we can view from the same console with the CMD command and write:

ipconfig / all

And something like:

Ethernet adapter Ethernet 2: Specific DNS suffix for the connection..: Description……………: Intel (R) Ethernet Connection I219-V # 2 Physical address………….: & amp; amp; amp; amp; amp; amp; nbsp; 12-34-56-78-90-12 DHCP enabled………….: yes Automatic configuration enabled…: yes Link: local IPv6 address…: a4656523245465 (Preferred) IPv4 address…………..: 192.20.30.56 (Preferred) Subnet mask…………: 255.255.255.0 Concession obtained…………: & amp; amp; amp; amp; amp; nbsp; The lease expires………..: & amp; amp; amp; amp; amp; nbsp; Default Gateway…..: 192.20.30.1 DHCP server…………..: 192.20.30.1 IAID DHCPv6……………: 270317356 DHCPv6 client DUID……….: DNS servers…………..: 8.8.8.8 10.20.30.1 NetBIOS over TCP / IP………..: enabled

Where we can perfectly identify the DNS server with 8.8.8.8 (Google's DNS) and 10.20.30.1 (The gateway, which in this case is the router).

Best public DNS servers

We leave you for what we are the four best public and free DNS servers that exist today.

CLOUDFLARE

Cloudflare joins the Best Free DNS Club as one of the fastest services we can find today. the premise of the company is simple, speed and above all, security, when browsing through its global VPN network.

It has also recently launched an application called 1.1.1.1: Faster & Safer Internet for iOS and Android that we recommend you try. it is as simple as installing an application and pressing the button to activate DNS.

The addresses are:

1.1.1.1

1.0.0.1

IBM QUAD9

It is one of the great news in our list of free DNS this year. IBM has been encouraged and launched IBM QUAD9 that makes use of an engine with artificial intelligence IBM X-Force and almost 20 databases protected against obstruction to our system. Ensuring ourselves in security, privacy and performance. At the moment one of our favorites?

His direction is:

9.9.9.9

149, 112, 112, 112

OpenDNS

The first is OpenDNS that has been one of the best public DNS servers for many years and that incorporates serial Parental Control service. There is a VIP version that comes out around 20 euros and that offers enough statistics on the use of your devices.

Their addresses are:

208.67.222.222

208.67.220.220

DNS Google

We put it in second place because we do not like that when using it, it tracks and records everything we do. Too much already knows… so that it leaves another trace along the way. Completely free and it always gives very good results in both IPv4 and IPV6.

Your IPv4 addresses:

8.8.8.8

8.8.4.4

Your IPv6 addresses:

2001: 4860: 4860:: 8888

2001: 4860: 4860:: 8844

Norton ConnectSafe DNS

Norton also offers its own DNS server that has automatic and blocked filtering based on its database. It is quite interesting because it incorporates three options to choose from:

Option A: Protection against malware, phishing and fraudulent sites. Option B: Pornography. Option C: Pornography + others (gambling, suicide, drugs, alcohol…).

As you can see these options are quite interesting. I detail the addresses that they have respectively:

Option A:

199.85.126.10

199.85.127.10

Option B:

199.85.126.20

199.85.127.20

Option C:

199.85.126.30

199.85.127.30

Level 3 DNS

This is widely used in Internet providers both in Europe and Latin America. It is not usually the fastest and therefore it is in fourth position. I leave you with their addresses:

209.244.0.3

209.244.0.4

4.2.2.1

4.2.2.2

4.2.2.3

4.2.2.4

Verisign

It is one of the largest network infrastructure companies that currently exists in the world. It also offers totally free and fast DNS:

64.6.64.6

64.6.65.6

DNS.Watch

From United Kingdom (UK) offers one of the best DNS servers on the market. It offers us up to two addresses to be able to use it quickly:

84.200.70.40

84.200.69.80

COMFORTABLE DNS

One of the great sellers of SSL certificates on the planet and that we currently use on all our websites. It also offers the possibility of using your free DNS addresses:

8.26.56.26

8.20.247.20

With this we finish our guide to the best free public DNS Servers. Which one do you use? Do you recommend us to include any more in the list?