August 19, 2022

Why is the PTR record so important?

PTR record is not one of the most popular DNS record types, but it is absolutely important. Why? We will explore this and its main purpose in this article. So, let’s start.

PTR record: Meaning

The reverse equivalent of an A record is known as a PTR record. The PTR record maps an IP address to a hostname, whereas the A record translates a domain name to an IP address. As a result, the Pointer record assures that your IP address connects to your host in an official manner.

If you’re utilizing both internal and external mail servers, you’ll need to set up the Pointer record. This record improves the reliability of sending servers by allowing the receiving end to verify your IP address’s hostname. It’s a great strategy to defend yourself from all kinds of spammers.

(more…)

Reverse DNS: Everything you need to know

Reverse DNS – what does it mean?

Reverse DNS, or simply rDNS, is a mechanism for translating an IP address into its matching domain name. Compared to the standard Forward DNS lookup, which resolves the domain name to its IP address, it serves the exact opposite purpose.

You can use it to establish that a specific IP address corresponds to a particular domain name. One of the most common reasons for using it is establishing trust in email servers. They use Reverse DNS lookups to make sure the email came from a legitimate source and isn’t a hoax.

(more…)

What is a subnet mask?

What is a network? 

A network is 2, or more devices (computers, IoT, mobiles, etc.) connected to each other for the purpose of exchanging data electronically. 

What is a subnet mask? 

The subnet mask is a separator that defines which part of the IP address is dedicated to the hosts (connected devices) and which part is dedicated to the network address. The subnet mask gives us the size of the network that we are working with. 

(more…)

What is ICANN?

ICANN is short of Internet Corporation for Assigned Names and Numbers. It is a non-profit organization that manages and maintains different databases related to namespaces and number spaces on the Internet.

In really short: ICANN coordinates the use of domain names and IP addresses so that the Internet, as we know it, can function without conflicts. Thanks to it, you can’t have two people who have the same domain name or two computers with the same IP address.

(more…)