Internet Censorship: How Countries Block Their Citizens from Entering Websites

Iran, Yemen, China, North Korea, Turkey, and many other countries on the globe have at one point or another started employing the practice of censoring the Internet domestically. This either partially or greatly restricted the international freedom of speech of its citizens. While a large portion of the world enjoys the ability to log into Twitter and say anything they want about their government and country, this isn’t the case in countries like Turkey, which enacted an active block of Twitter on March 20th, 2014. How do countries carry out Internet censorship? What methods have the most effect on a population?

Why Governments Censor


There are a few reasons why a government would want its population to be unable to communicate through the Internet freely:

  1. It is afraid of its population organizing a revolt. The Internet is an effective medium for organizing events, flash mobs, and even riots. Governments will block a social network, for example, with the intention of preventing people from messaging each other and publicly announcing their organized protests.
  2. Perhaps the government is afraid of ruining its outward image and wants to hide the ugly reality of its internal struggles. Countries like North Korea are very concerned about the image they display to other nations around the world. It may be a little too late to protect its reputation, but it’s been actively forbidding external Internet access for this exact reason.
  3. Incumbent politicians like to stay in power, no matter the country. Some take this to heart to such an extent that they block access to the Internet to rig elections safely without allowing minority groups to organize counter movements at a national level.

This may cover everything, but if you think I missed something, please feel free to discuss that in the comments section.

So, there are enough compelling reasons to censor the Internet to tempt a leader who has enjoyed the seat of power for many years. How does this happen, though?

ISP Filters

One of the less controversial ways of blocking Internet access to users within a country is to ask Internet service providers (ISPs) nicely to do this themselves. Many developed countries around the world have attempted to use this method only to succumb to the will of the populace. However, more oppressive regimes can strong-arm their ISPs into the same process. This is even easier when the entire Internet infrastructure is state-owned.

The problem (fortunately) with this method is that it’s easy to circumvent. Any citizen can just use onion routing or a proxy to access the sites he wants. The government counts on citizens not being aware of these choices. However, it’s inevitable that one day ISP filters will be completely ineffective as people become more educated about how to get around them.

ASN Blocking

When proxies cause problems, autonomous system number (ASN) blocking provides a very controversial way to block access to particular websites. To make this easier to understand, each ISP has an ASN allocated for particular IP ranges it controls. If a government wants to block a website, it can “trick” its own infrastructure by allocating a smaller ASN (creating a path of least resistance) with an IP range containing the IP of the website it wants to block. This will direct routers to go to its own version of a particular website rather than the website itself. It wouldn’t matter whether you type the IP address or the URL for YouTube. You won’t be able to access it either way because the government has fooled your router into thinking that the IP address is hosted in that particular country.

TLD Name Server Seizing

If you’re in possession of a top-level domain (TLD) server, you have a lot of flexibility. A top-level domain is what you see at the end of a domain name (“.net,” for example). As the country in control of a TLD, you can deny any domain name requests to it. This method is also easy to circumvent. If you know the IP address that the domain is pointed to, you can just type it up in your address bar and enter the site. This, and the fact that the TLD server needs to be in your country, makes TLD blocks very unfeasible and inefficient.

Let’s Discuss!

Got a question or an idea about what we just covered? Post a comment below and continue this discussion!

Miguel Leiva-Gomez Miguel Leiva-Gomez

Miguel has been a business growth and technology expert for more than a decade and has written software for even longer. From his little castle in Romania, he presents cold and analytical perspectives to things that affect the tech world.


  1. We are fast approaching the stage of the ultimate inversion: the stage where the government is free to do anything it pleases, while the citizens may act only by permission; which is the stage of the darkest periods of human history, the stage of rule by brute force.

  2. We will promote new tools of communication so people are empowered to connect with one another and, in repressive societies, to do so with security. We will support a free and open Internet, so individuals have the information to make up their own minds. And it is time to embrace and effectively monitor norms that advance the rights of civil society and guarantee its expansion within and across borders.

  3. I think that government should not watch/ regulate everything. But they should defiantly monitor key words.

    1. Monitoring Keywords is ok to some extent but It’s still considered an invasion of privacy.

  4. I don’t think we are necessarily censored as much as people think we are, for example, us as the American people are mostly allowed free roam on the internet, whereas in China, They are restricted to only Government run sites. School blocked sites on the otherhand, remove a distraction from the students and allow for better learning

    1. American people are indeed free to roam the web, but they are still reading things that come from media sources that aren’t exactly transparent or politically unbiased. When their only justification for supporting a policy is pathos (emotion or a ‘moral’ sense of justice), beware. They must justify new policies with empiricism, quoting studies with proper methodology, not manipulated or grossly exaggerated extrapolations.

  5. The thing about it is in other countries, unlike the US, there is no Freedom of speech we think that because we have it here it’s everywhere which is really not the case. So they have all rights to block expressions that people have. It may not be right but it’s what it is.

    1. A lot of countries outside the US have a greater level of freedom of speech (non-PC), such as Romania, Italy, and Germany (to some extent).

    2. Michael, would you like to buy a bridge? I have several, at a quite affordable price.

      In the US we only have an illusion of free speech. You are free to say anything you want, about anybody you want as long as it is approved by the thought police. There is no overt censorship but hundreds of special interest groups exert covert censorship. Chances are that anything you say will offfend one or more of them.

  6. Dear Mr. Leiva-Gomez,

    For example, the U.S. ISP and its owner generally IP-block whole countries so their customers cannot communicate via email with people in the E.U.

    Also their own abus[email protected]/[email protected] addresses cannot be emailed to from the E.U.

    Behind CyberWire looms Enom which obstruct perfectly legitimate businesses in foreign countries’ ->

    It is not only Iran, Yemen, China, North Korea, Turkey et al. excluding their own people from legitimate communication with foreign countries.

  7. is at least to be called a dubious company, blocking whole ip ranges by countries so emails from outside america cannot reach their customers. not a smart move to have your mailbox with them. on their website, they also offer a “remote antivirus removal”. not a remote virus removal, but – you have read this right – a remote antivirus removal! so this means they compromise foreign computer systems. to remotely remove antivirus programs (just like avira antivirus et al) from other people’s computers is called hacking. even in utah. in that case, you can rightfully assume that also all of your emails are being read and used against you.

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