Dns stands for Domain Name System, and is used to convert domain names to ip addresses.
If you are here you might be asking one of our FAQ: What are Sago's DNS servers?
You are using it right now! Somehow your browser converts kb.sagonet.com to an ip for your computer to connect to.
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Recursive DNS
This is the normal type of DNS that everyone needs to take hostnames to ips. On linux servers your recursive dns servers are in /etc/resolv.conf
Main article: Recursive DNS
Authoritative DNS
Authoritative DNS is the tricky stuff. These are what a server admin would setup if they were hosting the servers that are in charge of a particular domain. For example, ns1 and ns2.sagonet.com are in charge of sagonet.com. They are authoriatative.
Main Article: Authoritative DNS
Reverse DNS
Reverse DNS or PTR records are not really a different kind of dns, but a particular type of record for a zone. (PTR Record. They commanly come in to play when it comes to Spam.
Main Article: Reverse DNS
Types of DNS Entries
- A
- These take names to ips, like www.sagonet.com -> 65.110.32.145
- PTR
- These take ips to a hostname, like 65.110.32.145 -> www.sagonet.com
- MX
- MX records are used by mail servers to look up who to send mail to.
- CNAME
- This is an alias to another name. Like www.sagonet.com CNAME sagonet.com
- TXT
- Text records, these are free form text strings, used for things like SPF records.
- NS
- These say which servers are authoritative for the domain.
See Also
- Creating a Slave DNS server
- Open DNS Servers - What they are and how to close them
- DNS in Plesk
- DNS in Cpanel
- DNS in Interworx
