ONiCU – Automaticly grabs latest Tier1 or Tier2 IPv4 addresses off OpenNIC’s website and adds them to your dhclient.conf file.

ONiCU v1.0 {2014-02-27} by TuxLyn
http://io.gotux.net/code/ruby/onicu.rb
MD5: c8ca6f3ac7f01e1fbb89859b4ed3cd34
Required: Ubuntu Linux, Ruby 1.9+

More details on http://blog.gotux.net/code/ruby/onicu/