I worked at Xerox for 8 years as a Solution Architect and it annoyed me so damn much that they are sitting on 13.* yet hardly using it and I can't imagine that has changed in the few years since I left. From what I can remember they were using less than 20% of the address space they have.

Then again running out of v4 addresses is the best thing to happen really. Still it annoys me a big company can sit on so many addresses for no reason.