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# Visual Representation of the size of IPv6 versus IPv4
- URL: https://larrysalibra.com/visual-representation-of-the-size-of-ipv6-versus-ipv4/
- Published: 2009-03-08T16:00:00.000Z
- Updated: 2009-03-08T16:00:00.000Z
- Author: Larry Salibra
- Tags: technology, blog, #Import 2024-08-23 13:31

[Aaron Toponce](http://pthree.org/?ref=larrysalibra.com) over at[ Planet Ubuntu](http://planet.ubuntu.com/?ref=larrysalibra.com) has an [excellent article with graphics](http://pthree.org/2009/03/08/the-sheer-size-of-ipv6/?ref=larrysalibra.com) that really puts the vast size of the IPv6 address space in perspective in relationship to the almost used up IPv4 address space in perspective.

I would just add that 64bits of the 128bit IPv6 address space do not necessarily have to be dedicated to the MAC address of one's Ethernet adapter. [Google (IPv6-only link)](http://ipv6.google.com/?ref=larrysalibra.com) does not do this on their servers and neither do we on our IPv6-enabled sites.

On a related note, the testing of OpenID login via IPv6 with [Pay4Bugs](http://www.pay4bugs.com/?ref=larrysalibra.com) as the OpenID IPv6-enabled rely party and [IPv6-enabled OpenID provider](http://87id.com/?ref=larrysalibra.com) that some kind souls on the [The Great Pv6 Experiment mailing list](http://mail.your.org/mailman/listinfo/v6test?ref=larrysalibra.com) had been helping with uncovered a least one bug in the Ubuntu 8.04 Ruby on Rails stack. We were able to fix the bug and a post will be coming soon regarding the details and the fix.