How Many DNS Servers Should I Have?

How many DNS servers are there?

13Root name server overview In total, there are 13 main DNS root servers, each of which is named with the letters ‘A’ to ‘M’..

How many DNS servers does Google have?

Google also has a public DNS (8.8. 8.8 and 8.8. 4.4 for IPv4 service, and 2001:4860:4860::8888 and 2001:4860:4860::8844 for IPv6 access), but Cloudflare is faster than Google, and faster than OpenDNS (part of Cisco) and Quad9.

How long does the DNS cache last?

86,400 secondsA. By default, Windows stores positive responses in the DNS cache for 86,400 seconds (i.e., 1 day) and stores negative responses for 300 seconds (5 minutes). To modify these values, perform the following steps: Start a registry editor (e.g., regedit.exe).

What DNS servers should I use?

Public DNS Servers Personally, I prefer OpenDNS (208.67. 220.220 and 208.67. 222.222) and Google Public DNS (8.8. 8.8 and 8.8.

What are the 13 root DNS servers?

The root servers are operated by 12 different organizations:A VeriSign Global Registry Services.B University of Southern California, Information Sciences Institute.C Cogent Communications.D University of Maryland.E NASA Ames Research Center.F Internet Systems Consortium, Inc.G US DoD Network Information Center.More items…

Which Google DNS is faster?

Faster than Google and OpenDNS Google also has a public DNS (8.8. 8.8 and 8.8. 4.4 for IPv4 service, and 2001:4860:4860::8888 and 2001:4860:4860::8844 for IPv6 access), but Cloudflare is faster than Google, and faster than OpenDNS (part of Cisco) and Quad9.

What is the most secure DNS server?

5 DNS Servers Guaranteed to Improve Your Online SafetyGoogle Public DNS. IP Addresses: 8.8.8.8 and 8.8.4.4. … OpenDNS. IP Addresses: 208.67.220.220 and 208.67.222.222. … DNS Watch. IP Addresses: 84.200.69.80 and 84.200.70.40. … OpenNIC. IP Addresses: 206.125.173.29 and 45.32.230.225. … UncensoredDNS. IP Addresses: 91.239.100.100 and 89.233.43.71. … 16 comments Write a Comment.

How do you confirm DNS is working?

In order for you to check whether the network connectivity of your DNS is working properly, you can log on to the DNS server and then ping a few machines. You can also look for random devices and try pinging your DNS server from them. If this works, then it means that your network connectivity is not to blame.

What causes DNS failure?

One of the most common causes of DNS errors is the TCP/IP software, or the Dynamic Host Configuration Protocol (DHCP), which assigns IP addresses to devices and handles the DNS server addresses.

Can I have 2 DNS servers?

At a minimum, you’ll need two DNS servers for each Internet domain you have. You can have more than two for a domain but usually three is tops unless you have multiple server farms where you would want to distribute the DNS lookup load. It’s a good idea to have at least one of your DNS servers at a separate location.

What happens if DNS server fails?

With all the DNS servers down, no DNS queries over the network could be answered. As soon as any local cache of DNS query results expires, you would not be able to use DNS names to resolve IP addresses. Whilst it would still be possible to access other systems over the Internet, but only by using their IP addresses.

Why DNS server is required?

Domain Name Servers (DNS) are the Internet’s equivalent of a phone book. They maintain a directory of domain names and translate them to Internet Protocol (IP) addresses. This is necessary because, although domain names are easy for people to remember, computers or machines, access websites based on IP addresses.

What does changing your DNS to 8.8 8.8 do?

8.8 (and 8.8. 4.4) is Google’s public use DNS server. … If you type example.com into the address bar, for example, your DNS translates it to 93.184. 216.119 which is something a computer can work with.

Do I need a secondary DNS server?

A DNS server can be primary for one zone (domain) and secondary for another. The DNS specifications (RFCs) require that each domain name is served by at least 2 DNS server for redundancy. … Only one DNS server should be configured as primary for a zone, but you can have any number of secondary servers for redundancy.

Can I use 8.8 8.8 DNS?

If you can’t (or don’t want to) do that, use your ISP’s name server and configure another, publically-available server (and, yes, 8.8. 8.8 is a valid choice) as a backup. It is always good to have more than one dns server (and, for that matter, more than one ntp server) configured – redundancy is usually good.

Is it safe to change DNS server?

Changing your current DNS settings to the OpenDNS servers is a safe, reversible, and beneficial configuration adjustment that will not harm your computer or your network. … You can print out this page and write down your previous DNS settings if desired.

Are Google DNS servers safe?

No. Google Public DNS is purely a DNS resolution and caching server; it does not perform any blocking or filtering of any kind, except that it may not resolve certain domains in extraordinary cases if we believe this is necessary to protect Google’s users from security threats.

Why do I have 2 DNS servers?

Better distribute the load between a primary and secondary server(s). Can provide redundancy (information represented more than once). This can be useful if the primary server ever goes down. It makes DNS servers more secure, especially against DDoS (Distributed Denial of Service Attacks).

What is the fastest DNS server?

Some of the most trustworthy, high-performance DNS public resolvers and their IPv4 DNS addresses include:Cisco OpenDNS: 208.67. 222.222 and 208.67. 220.220;Cloudflare 1.1. 1.1: 1.1. 1.1 and 1.0. 0.1;Google Public DNS: 8.8. 8.8 and 8.8. 4.4; and.Quad9: 9.9. 9.9 and 149.112. 112.112.

Who runs the root DNS servers?

ICANN operates servers for one of the 13 IP addresses in the root zone and delegates operation of the other 12 IP addresses to various organizations including NASA, the University of Maryland, and Verisign, which is the only organization that operates two of the root IP addresses.

Can I mix DNS servers?

You should therefore look at the performance of individual DNS servers and set the “Preferred DNS Server” as the one that has the lowest score. In fact, you may also mix servers – like you can use Google Public DNS as the Preferred DNS server and OpenDNS as your Alternate DNS server.