Flush DNS

Flush DNS: how to clear your DNS cache

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.

Clear DNS cache

Clear DNS cache: how to empty the DNS resolver cache

Operating systems tend to collect various information on user surfing behaviour 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).

DNS leak

DNS leak

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.

Secondary DNS

Secondary DNS

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.

DNS zone

DNS zone

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 propagation

What is DNS propagation?

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.

Raspberry Pi projects

30 Raspberry Pi projects that show the possibilities of the mini computer

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 centre. Discover 30 interesting Raspberry Pi projects to try out at home.


DNSBL: What is a Domain Name System-based Blackhole List?

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.

Dedicated IP

Dedicated IP: dispelling common myths

For many years, dedicated IPs were an important component within hosting and mailing. To this day, you can choose a dedicated IP address for your project from a wide variety of services. But is a dedicated IP really a better solution than a shared address? We’ll show you what you need to know about the two IP types and dispel common myths.

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