If so then it is you that are saving the IP addresses not the carrier
(this
is why we have many diffrent catagories in section 5).
As to the security concerns, where I have seen this done the carriers are
usually using NAT to subnet their network (as described in 5.4) so that
they
have one large block and are using it to reduce problems in their
administration network. But you are right to you there is still no
security
benifit.
Actually, I don't have NAT in my network. The setup is strange, because
there is this interesting thing going on: My IP access is provided by a
company that provides me access (with a VPN) to my company. However, to
get access to Internet I need a second provider. There are multiple
providers I can choose from and I have a contract with one of them. To
access the Internet I have to "activate" the access, by first choosing
my provider from a web menu and then giving the credentials (username,
password). After that I have Internet access. However, as by the time I
boot my computer it is not known which provider's access I'm going to
use they cannot give me the real IP addresses. When I then activate the
Internet access they would have to renumber my computer's IP address it
is easier to NAT.
I actually can connect up to five computers to the Internet and really
all private addresses seem to correspond to an individual public
address...