Website Relaunch

Nearly five years after we published OnionCat for the first time at the 25C3 in Berlin we chose that it is time now to relaunch the primary website. Nowadays, we know that there is much more surveillance in the background as many of us might have expected as Ed Snowden has disclosed.

OnionCat being a Tor-based decentralized peer-to-peer VPN is a powerful tool to protect against surveillance. It can be used to easily connect to remote systems using protocols different than HTTP such as e.g. SSH or DNS simply by using their OnionCat-created IPv6 addresses.

This website is intended to give as much useful information about OnionCat to any user who is interested in securing network communication against surveillance.
It is not complete yet but we do our best to provide more information as soon as possible.

We have several plans to improve OnionCat and add new features.
Don’t hesitate to contact as and of course have fun and feel free — as in freedom — to use OnionCat and give us feedback!

The old Trac wiki is accessible at


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  1. huhu, nice idea.

    i am planning to use OnionCat for RetroShare.

    OnionCat offers a lot of Interresting possibilitys.

    habs leider erst vor paar tagen entdeckt. ganz im verborgenen.

    grüße nach st.p

  2. aber warum ist mit dem relaunch das wiki away?

    1. Ist es nicht. Steht ganz unten im Text πŸ˜‰

    • wim on August 21, 2013 at 12:31 pm
    • Reply

    Hello, are there services available to test?

    1. I’m running this fd87:d87e:eb43:744:208d:5408:63a4:ac4f which replies to pings.

  3. Why doesn’t anonymous help more people

    • Martin on June 16, 2014 at 12:32 pm
    • Reply


    onioncat is an excellent piece of software. I’m loving it. Where have all the services gone? For example the IRC-Server and the web-based service registration directory. Are they having new adresses or are they down?



    1. Unfortunately, the guys who operated those two services “disappeared” and I don’t know if somebody picked up their ideas. You’re welcome to operate a service!

    • Martin on June 19, 2014 at 2:41 pm
    • Reply

    Thank you very much! Please try

      • Martin on June 20, 2014 at 12:42 pm
      • Reply

      http:// [fd87:d87e:eb43:d350:85d3:e64d:7427:809c] :8482

      Remove the space characters

      1. The hidden service seems not to be runnning.

          • Martin on June 21, 2014 at 12:11 pm
          • Reply

          I’m sorry I had to restart all services. Please try again. I tried this from another machine also with tor and onioncat installed:

          1. Sorry, still not available, tried from 2 different machines:
            Jun 23 13:38:14 onioncat[2726]: [connector] trying to connect to "2niilu7gjv2cpae4.onion" [fd87:d87e:eb43:d350:85d3:e64d:7427:809c] on 12
            Jun 23 13:38:16 onioncat[2726]: [connector] SOCKS request failed, reason = 91
            Jun 23 13:38:16 onioncat[2726]: [connector] rescheduling SOCKS request

    • Martin on October 30, 2014 at 11:55 am
    • Reply


    sorry for the late reply. I discovered some strange routing issues. I set up another instance for a friend and from there I’m also not able to connect to my service mentioned above. But connecting to my second onioncat instance on another machine works very well. I’ve no explanations for that. Here is the output of a nmap scan, tried from my friends machine:

    No luck πŸ™ but when I’m issuing the same command from my second onioncat instance it works very well:

    Please try this command:

    Thanks in advance


    1. Nmap scanning without setting minimum timeouts may always be unsuccessful because of the high delays of the Tor circuits.

    • Martin on October 30, 2014 at 4:26 pm
    • Reply

    Sorry… got a new IP πŸ™‚ The command listed at
    should work very well now πŸ™‚

    1. Just tested it and it works πŸ™‚ Congrats!

    • Kevin on November 30, 2014 at 6:35 pm
    • Reply

    Can’t even install it. I’ve already got Tor installed with the Vidalia bundle, plus the Tor Browser. However, if I try to install OnionCat 0.1.13 it insists that I install Tor first; “You have to install Tor first. Press Yes to download and instal Tor”. This takes you straight to the Tor Browser for Windows which I’ve already installed.

    Pressing “No” ends the instal.

    Upshot is, it is impossible to install OnionCat 0.1.13. πŸ™

    • Kevin on December 2, 2014 at 10:39 am
    • Reply

    Any assistance? The OS is XP.

    1. The Windows package yo’re talking about is completely outdated. Unfortunately I found nobody which is able to create a new package. Thus, you should build and install from source. See configuration and installation page.

      1. Here is a simple ZIP file for Windows: Read the README file!

  4. OnionCat ip not available from other devices in Tor network.

    I’m using Linux and installed Tor and OnionCat. My goal is to access my web server over ocat ip. I tried this:

    1. Created a Tor hidden service. Onion url: http://4ax5y56zepbahajs.onion I can this over Tor

    2. Started OnionCat with “sudo ocat 4ax5y56zepbahajs.onion -U” and received ip address “fd87:d87e:eb43:e02f:dc77:d923:c203:8132”

    3. I can ping the above ip from my local machine. Also, when I open http://[fd87:d87e:eb43:e02f:dc77:d923:c203:8132]/ in firefox, I get the webpage on local PC

    My problem is, I can NOT ping the above ip or access that url from other PC setup with Tor and *OnionCat*

    Any help is greatly appreciated!

    1. Most probably the reason is that you didn’t setup the correct port for OC for the hidden service. I assume that you configured something like that for your web server:
      HiddenServiceDir /var/lib/tor/other_hidden_service/
      HiddenServicePort 80

      OC does not use port 80 but port 8060. Thus, you have to add the following line to your torrc (directly behind the previous stanza):
      HiddenServicePort 8060


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