From: Marco Ceresa on
ipaddress version 0.6.0 has been released!

http://github.com/bluemonk/ipaddress

IPAddress is a Ruby library to manipulate IPv4 and IPv6 addresses in a
modern and productive way. In this release we focused on making the
library more compatible with IPAddr.

I've just opened a discussion group to discuss about future
developments, feature requests and support. You're more than welcome
to join:

http://groups.google.com/group/ruby-ipaddress

Feel free to come back to me for any question, bug report or feature request.
Hope you will enjoy it!

Here is the changelog:

== ipaddress 0.6.0

=== API changes
* IPv4#to_s now returns the address portion only,
to retain compatibility with IPAddr. Example:

IPAddress("172.16.10.1/24").to_s
#=> "172.16.10.1" # ipaddress 0.6.0

IPAddress("172.16.10.1/24").to_s
#=> "172.16.10.1/24" # ipaddress 0.5.0

* IPv6#to_s now returns the address portion only,
to retain compatibility with IPAddr. Example:

IPAddress "2001:db8::8:800:200c:417a/64".to_s
#=> "2001:db8::8:800:200c:417a" # ipaddress 0.6.0

IPAddress "2001:db8::8:800:200c:417a/64".to_s
#=> "2001:db8::8:800:200c:417a/64" # ipaddress 0.6.0

* IPv6::Unspecified#to_s, IPv6::Loopback and
IPv6::Mapped#to_s now return the address portion only,
to retain compatibility with IPAddr.
* IPv4::summarize now returns an array even if the
result is a single subnet, to keep consistency
and avoid confusion

=== New methods
* IPv4#to_string and IPv6#to_string: print the address
with the prefix portion, like the #to_s method in
ipaddress 0.5.0
* IPAddress::parse, for those who don't like the wrapper
method IPAddress()
* IPv6#to_string_uncompressed, returns a string with the
uncompressed IPv6 and the prefix
* IPv6::Mapped#to_string, returns the IPv6 Mapped address
with IPv4 notation and the prefix
* IPv6#reverse, returns the ip6.arpa DNS reverse lookup
string
* IPv4#arpa and IPv6#arpa, alias of the respective #reverse
methods
* Prefix#+, Prefix#-

=== Library structure
* Moved all the IPAddress module methods from
lib/ipaddress/ipbase.rb to lib/ipaddress.rb
* Removed IPBase superclass
* IPv4 and IPv6 classes no longer inherit from IPBase
* Removed lib/ipaddress/ipbase.rb
* Removed test/ipaddress/ipbase_test.rb

=== Minor fixes
* Replaced Ruby 1.9 deprecated Hash#index with Hash#key
* Removed require ruby-prof from tests which was causing
users to install ruby-prof or manually remove the line
* Removed "must" method from tests, replaced by normal
Test::Unit methods
* Removed duplicate Jeweler entry in Rakefile
* Made Integer#closest_power_of_2 more general by adding
an optional limit parameter
* Fixed summarization algorithm (thanks to nicolas fevrier)
* Fixed bug in prefix_from_ip (thanks to jdpace)

=== Documentation
* Normalized README rdoc headers
* Added documentation for IPAddress::Prefix
* Added documentation for IPAddress::IPv4 and
IPAddress::IPv6
* Fixed formatting
* Fixed lots of typos