I migrated my server and in the process lost a block of 10 dedicated IP addresses I had. So I tried to sign up for the 10 addresses again, and got this:
Due to the global shortage of IPv4 addresses, we are now required to request justification for dedicated IP address requests. Each dedicated server comes with 4 dedicated IP addresses, in addition to the primary shared IP address. Additional IP addresses must be requested in blocks of 4 IPs ($16.00/month for each block of 4). Please be aware, at this time, the only acceptable justification for a dedicated IP address we can accept is for use with an SSL certificate. You will need to provide at a copy of the certificate(s) which will be installed, however, we do not need to install the certificate for you.
Obviously IPv6 is meant to relieve this but it is still a minority of Internet traffic.