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Access Blocked Websites by Bypassing URL Filtering

30 Nov, 2009 by Raju
Featured, Tiny Tip

access-blocked-websites

I have previously written some articles/tutorials on How to access blocked websites at school/college/office/cyber cafes etc.

These methods can still help you to unblock websites. But then, there is no fool-proof way as such since it all depends on how smart your network admin is. So, here I present yet another way to access blocked sites which is based on the method of bypassing URL filtering employed by the admin.

Access Blocked Websites by Bypassing URL Filtering

Most of the network admins in schools and colleges block a website by its name (http://www.xxx.com) or by its IP address. Assuming this is the case, we will learn about a way to bypass the URL filtering.

Step 1: Find out the IP address of the blocked website which you are trying to access. Let us take http://techpp.com as our example. Go to Start –> Run and type cmd

unblock-site-1

A new window opens. Type ping techpp.com and press Enter. You will see the IP address as shown below.

unblock-site-2

IP address of techpp.com = 67.222.24.82

Step 2: Convert each of the 4 numbers (67, 222, 24 and 82) into an 8-digit binary value. In order to do this open your Windows calculator, select Scientific view.

unblock-site-3

Make sure ‘Dec’ is selected and enter the first number and select ‘Bin’. This would give you 8 digit binary value of 67 = 01000011.

unblock-site-4

Repeat the process for other 3 numbers as well. You will get four 8-digit binary equivalents. Put them all together

01000011110111100001100001010010

Step 3: Convert 01000011110111100001100001010010 into a decimal value. For this, reverse the process explained in Step 2 i.e Select Bin and input 01000011110111100001100001010010 (copy-paste) and then click Dec. This will give you the decimal equivalent of the 32 digit binary number = 1138628690

unblock-site-5

Step 4: Go to your browser and in the address bar type http://1138628690, this should open http://techpp.com, but it doesn’t, reason given below.

Imp: You might have observed that http://1138628690 is giving Bad Request error. This is because the above trick doesn’t work for websites running on virtual hosts. But other sites like Google, Gmail etc will work flawlessly (http://1249729384 or http://3512041827/)

I do not claim to be an expert in this, so feel free to share your knowledge, tips, tricks and hacks to perfect this method. Did this work for you?

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Raju Raju is the owner and editor-in-chief of TechPP. A proud geek and an Internet freak, who is also a social networking enthusiast. You can follow him on Twitter @rajupp
  • satyajit

    Really a nice post…..you rock Raju

  • http://www.niharsworld.com/ Nihar

    Great tip yaar.

    I have twitted it.

  • ibheck

    thanks for your info

  • Brian

    Ya i know as it was shown by ankit fadia in what the hack.I knew it from there before it was posted here

  • http://techpp.com Raju

    good! but did it work for you?

  • jmaine

    Great post Raju would definately put it test..your the bomb

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  • http://twitter.com/tyrantblog Nimil

    Unfortunately this didn’t work for me. Our proxy says “Unable to determine IP address from host name for 1138628690″ ( i tried your example). I guess, if you are behind the proxy this trick may not work or your office network configuration also may matter.

  • http://techpp.com Raju

    Its not about the proxy, but the method of blocking used. This would work if the admin has blocked the website based on the url name or keyword. Also, it has a better chance of working in Firefox.

  • http://www.abhishekbhatnagar.com abhishek

    I tried to open through the numeric URL, but firefox says it could not understand.

    Am I Doing something wrong ?

  • http://techpp.com Raju

    Did you try the URL mentioned in the article (for techpp, google)? It should not give that error atleast, for techpp, it wont work as I mentioned, for Google, it must not give such an error

  • idigiti

    Anybody tried rapidshare? Pl give opinion. I need rapidshare downloads behind corporate firewall

  • Anonymous

    U copied all dat stuff 4rm what the hack. HaHaHa.

  • http://techpp.com Raju

    Great to know!! Mr Ankit spoke about converting URL to Binary, which isn’t enough and doesn’t work.

  • http://www.socialblogr.com/ SocialBlogr

    Nice trick, but why that link doesn’t work on my browser? It seems a broken link. :(

  • http://www.niharsworld.com/ Nihar

    Raju, I mentioned about this post in my Friday Link Party http://www.niharsworld.com/2009/12/11/friday-night-links-party-11-december-2009/

    Did you get the track back. Do let me know. Thanks.

  • http://techpp.com Raju

    No Nihar. I didnt get. But thanks for liking and linking it

  • http://www.ankit4u.net Ankit Nahar

    Nope doesn’t work in Dubai bcoz of Etisalat ISP :)

    Please help more !!!

  • Rajshekar Reddy

    Gr8 tip…keep posting

  • PReetham

    keep posting on such useful things

  • Alok

    how to i know ip address using mac???

  • hello

    not working if using OpenDNS.
    simply use the ip address will do the trick.

  • http://meetshriram.blogspot.com Sriram

    At my work place Gmail is blocked. I tried this trick, but didn’t worked. :(

    -Sriram

  • yogesh

    its not working for orkut.can it be work?

  • http://techpp.com Raju

    as mentioned in the first paragraph of the article, it all depends on how smart the network admin is. There is no guarantee that this trick works always.

  • Shehan

    I have a problem my windows xp scientific calculator giving the wrong number. It gives me a 7 digit number. What can I do 4 this plz help me.

  • anonymous

    The calculation method above is clumsy.
    If IP is a.b.c.d just do a*256^3 + b*256^2 + c*256 + d.

    e.g.
    67.222.24.82 =>
    67*256*256*256 + 222*256*256 + 24*256 + 82 = 1138628690

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