ncdns is software for accessing .bit domain names. If you want to access .bit domain names, ncdns is what you want to install. (Technically speaking, ncdns is a Namecoin to DNS bridge. It allows software that speaks the DNS protocol to use Namecoin.)


You can download ncdns at the Beta Downloads page.


An installer wizard is available, which will also install the necessary dependencies (Namecoin Core, the BitcoinJ/libdohj SPV name lookup client, and Dnssec-Trigger). It also sets up TLS certificate validation for .bit domain names if a supported web browser is installed. Currently, the following web browsers are supported for Namecoin TLS on Windows:

  • Chromium
  • Google Chrome
  • Google Chrome Canary
  • Opera

Other OS’s

ncdns plain binaries (without install scripts) are available for most major operating systems. These require installing a Namecoin name lookup client (e.g. Namecoin Core) and a DNS resolver (e.g. Dnssec-Trigger) separately, and manually configuring ncdns to integrate with them (see instructions below). ncdns plain binaries are only recommended for advanced users at this time.

Supplying your own Namecoin node

The ncdns Windows installer will offer to install Namecoin Core or the BitcoinJ/libdohj SPV client, and configure ncdns to use it. However, there are several reasons why you might want to supply your own Namecoin node:

  • You’re not using Windows.
  • You want to use a Namecoin node that isn’t Namecoin Core or the BitcoinJ/libdohj SPV client.
  • You want to run a Namecoin node on a different machine than ncdns.
  • You want to handle updating Namecoin Core separately from updating ncdns.

If you want to supply your own Namecoin node, you can follow these steps:

  1. Make sure that your Namecoin node has the RPC server enabled.
  2. Open ncdns.conf. On Windows, it’s in the etc/ subdirectory of where you installed ncdns.
  3. Look for the namecoind access section.
  4. If your Namecoin node isn’t listening on, or if it’s listening on a non-default port, uncomment the namecoinrpcaddress line and fill in the IP and port.
  5. If your Namecoin node uses cookie authentication, fill in the path to the cookie file in the namecoinrpccookiepath line. Make sure that the ncdns user has filesystem permissions to read the cookie file. (Be careful not to grant the ncdns user filesystem permissions that it doesn’t need. For example, don’t grant ncdns the ability to read your wallet.)
  6. If your Namecoin node doesn’t use cookie authentication, comment out the namecoinrpccookiepath line, uncomment the namecoinrpcusername and namecoinrpcpassword lines, and fill in your Namecoin node’s RPC username and password.
  7. Restart ncdns. On Windows, you can do this by going to Control Panel -> Administrative Tools -> Services, right-click ncdns, and click Restart.