TLD nameservers identify the location of the name server managing the searched site. The latter responds with the requested IP address. The recursive DNS server stores Estonia Email List it in the local DNS cache, before sending it to your computer. DNS stores the IP address in the local cache, with a predefined lifetime (called TTL). This period of validity fixes the recording of the IP address in the cache. When this has expired, the request for the same site follows this path again. Even if it is essential for the proper functioning of internet connections, DNS has some weaknesses. The first is that internal DNS servers store the names and IP addresses of servers in their domain.

Thus, each DNS server shares this information with any user who requests it. So that makes it (and any DNS zone) a real source of information for hackers. DNS caches can be manipulated because they are not authoritative. So, if your DNS server gets hacked, your computer may be sent in the wrong directions. There is therefore a risk of referral to malicious sites. DNS transmits query information from internal stations to external servers. Knowing this, hackers create “hidden channels” to exfiltrate users’ private data. When you are new to SEO yourself , some of these techniques can be used by mistake. Likewise, it is not easy to know how to recognize them when delegating this SEO task .

These so-called unethical methods

These practices consist in over-optimizing a web page so as to deceive the Google robot and obtain better positioning in the results. Blackhat SEO therefore does not follow the rules and recommendations of the search engine and is exposed to heavy penalties. To avoid scams and missteps, we have therefore summarized the most common Blackhat SEO techniques. The Blackhat SEO is a set of optimization techniques for search engines that divert the standards and recommendations of the latter. The goal is to improve the positioning of a site very quickly. It is thus opposed to White Hat SEO which respects SEO standards.


Consist in over-optimizing a page in order to deceive crawlers like Google bot . For search engines, this is considered unfair competition to other sites. This can lead to heavy penalties. There are many Black Hat practices with use of some more important. They should be avoided for a healthy and sustainable natural referencing, with results in the key. The cloaking (in French camouflage) is a method of presenting a different page to the user (human) and search engine robot. For this, the SEO referrer will program the web server so that it presents the robot with optimized content respecting the rules of SEO, rather than the content actually visible on the site.

This technique results in a bad user experience

There is use of this technique in order to get faster results. Also adopted by websites with illegal or questionable content, it camouflages their activity in the eyes of Google while being referenced. This is to insert content (mainly a list of keywords or over-optimized texts and links) by hiding it by different means. by making it invisible: either by writing it in a color identical to the background, or by reducing it to zero size; In the early days of SEO in the 1990s, this method was easily and widely used. Since then the algorithm has been perfected and robots today easily identify this practice.

The only “hidden content” allowed is now found in the “Alt tags” of images. The condition is to use a key expression that describes the image well, because these tags are originally intended for the use of the blind and visually impaired. The keyword stuffing (keyword stuffing in French) is to incorporate a web page (and its meta description) keywords that are not relevant. In other words, we include expressions that have nothing to do with the original content of the page. The idea is to quickly position a website on several very different keywords. The goal is to obtain greater visibility .

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