Dig command (domain information groper) is a built-in command that you can find in any macOS computer and most Linux distros. You can use it to perform a quick check related to your DNS. See individual DNS records or check a name server from the Terminal app with a simple 1 line command.
It might not have a graphical interface, but you will get all you need in its output.
Here you have 5 dig command examples that will show you how to use it and how the answers look.
GeoDNS is the topic of today’s article. First, we will explore it in detail: its purpose, how it works, and its advantages.
GeoDNS stands for global traffic director or simply traffic director. It is an effective method for optimizing traffic to domains through the use of geographically based routing. It is also regarded as a cloud alternative for load balancing. In addition, it has a positive impact on network performance.
DNS records are text-based instruction for name servers (DNS servers) that can serve to link hosts to IP addresses, IP addresses back to hosts, services to hosts, one name of a host to another, combine to have complex rules, and more.
There are some DNS records that are quite essential for the DNS functionally. Here are the first you should learn.
The 5 DNS records you should know are:
A record is the first that you think about when you are talking about DNS. It links domain name / hostnames to their IP addresses. When somebody wants to visit a site, they usually know its name (domain name). But what they actually need to find it is its address. The visitor’s browser will go on a long search, from one DNS server to another, until it gets the A record that resolves the query. It gets it back, and the browser knows already where the site is and can load it.
This is the start of authority record, which indicates the primary DNS server – the authoritative name server. It also contains information about the DNS zone, and it is a must-have for the normal functionality of your DNS network. Inside it, you can find out which is exactly the authoritative server, who is responsible for it, how often should the DNS server refresh, and more.
It is a bit neglected DNS record, but it is a must-have if you want to send emails without problems. The PTR is a pointer record that has a functionality opposite to the A record, and it serves for Reverse DNS. It can point an IP address to a domain name. Why do you need it if people don’t remember IP addresses? For the machines! Because when you send an email, the receiver will want to check if this email was really sent on behalf of the domain it is saying or no. If the A record and the PTR record are not configured properly, the emails will go to spam. It can work both with IPv4 addresses and A records or with IPv6 addresses and AAAA records.
For many people, using a Dynamic DNS could be really advantageous. Put simply, this DNS service is a method for automatically refreshing new IP addresses. We’ll look at what Dynamic DNS is and how it works in more detail in this article.
Dynamic DNS, also known as DDNS, is a very useful service that allows us to keep the DNS constantly updated, with the correct IP address, even when the Internet Protocol is changing. Commonly, these kinds of resources include a Web server, a Web camera, or a computer for remote control operation.
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NSlookup is a built-in software that allows you to query domain name servers.
NSlookup commands can be used on most typical OSes like Windows, macOS, and Linux (Ubuntu, CentOS, Debian, etc.). Now you will see what is it, and how to you it?
For Windows
1. Press Windows key + the letter “R”. This will start the run application.
2. Write “cmd” and press “ok”.
3. Now, you are ready to use NSlookup command. See the examples below.
For macOS
1. Press the command button + Spacebar button.
2. Type the name of the app – Terminal.
3. Ready to write NSlookup commands.
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