In this organization, all servers and personal computers that I have worked on have a static IP belonging to the Public address space assigned to it. There must be NAT-based firewall/s as my external IP address differs from the local one.
As this is a big organization with many nodes I can see why they choose a public IP over a private IP for nodes on the private network.. These addresses would technically never be Illegal addresses as they are assigned by InterNIC to just this organization.
So, why go through the expense of registering all those IP addresses when there is a NAT in use (probably for most of the private addresses)..?