DNS

DNS resolver
What is a DNS resolver?
  • Know-how

DNS resolvers are a core component of the DNS, and therefore one of the cornerstones of the internet. For the most part, however, the resolvers work in secret. The importance of DNS resolvers only becomes apparent when the connection to websites and mail servers breaks down. Our article explains how to proceed and how the technology works in detail.

What is a DNS resolver?
Name resolution online: what is a DNS server?
DNS – the internet naming system
  • Know-how

Translating domain names to IP addresses is one of the central services on the internet. Your computer sends daily requests to the domain name system (DNS) without you knowing. Name resolution on the internet usually only captures our attention when something isn’t working properly. But ask yourself today: What is DNS? And what is a DNS server?

DNS – the internet naming system
Raspberry Pi projects
30 Raspberry Pi projects that show the possibilities of the mini computer
  • Know-how

Raspberry Pi is an inexpensive micro-computer that can behave like a standard computer in many respects. The innovative mini device can be used for a wide range of tasks - from setting up an operating system to surfing the web, to using it as a server or a media center. Discover 30 interesting Raspberry Pi projects to try out at home.

30 Raspberry Pi projects that show the possibilities of the mini computer
DNS propagation
What is DNS propagation?
  • Know-how

If you change the DNS of a website, it can take hours or even days for the changes to reach each server. This transition phase is called DNS propagation. Our article shows you what it is, where the delay comes from, and how you can easily test DNS propagation.

What is DNS propagation?
Flush DNS
Flush DNS: how to clear your DNS cache
  • Configuration

Operating systems, such as Windows or macOS, automatically save information about address resolution from systems and applications in the network in a DNS cache. The purpose of this practical cache is to speed up network traffic. Read on to find out why it’s useful to regularly clear the DNS cache and how exactly such a DNS flush works.

Flush DNS: how to clear your DNS cache
Clear DNS cache
Clear DNS cache: how to empty the DNS resolver cache
  • Configuration

Operating systems tend to collect various information on user surfing behavior on the World Wide Web in a so-called DNS cache. First and foremost, this cache gives a good overview of your web history. However, the stored entries can also cause connection problems. We will show you how to clear the DNS cache (as a user of Windows, Mac, or Linux).

Clear DNS cache: how to empty the DNS resolver cache
DNS zone
DNS zone
  • Know-how

Many Internet users have a basic idea of what the term “domain” refers to. After all, domains are abundant on the Internet via URLs. If you delve deeper into the subject, though, it quickly becomes confusing. “Name server,” “DNS zone,” “zone file”: What do these terms mean, and how are the concepts related? We’ll shed some light on the topic here.

DNS zone
DNSBL
DNSBL: What is a Domain Name System-based Blackhole List?
  • Know-how

Spam has been around since the dawn of email. Whether you’re dealing with annoying junk mail or emails containing dangerous malware, having a strong anti-spam system is essential. DNS-based blackhole lists (DNSBL) are a key part of most anti-spam technologies. Keep reading to find out what DNSBL are and how they work.

DNSBL: What is a Domain Name System-based Blackhole List?
Secondary DNS
Secondary DNS
  • Know-how

The DNS is one of the cornerstones of the Internet. To ensure that the resolution of domain names into IP addresses works reliably, the information of a DNS zone is stored redundantly all over the world. But how does the mechanism by which changes are made to the redundant copies work? The answer is rooted in the difference between primary and secondary DNS.

Secondary DNS
DNS leak
DNS leak
  • Know-how

Are you concerned about maintaining your privacy and use a VPN when surfing? Great – but this can make you uniquely vulnerable, too. We will show you the dangers posed by DNS leaks and explain how you can effectively protect yourself against them. In the process, we also look at DNS leak testers.

DNS leak