The Internet is running out of addresses, and adding new domain names and suffixes isn't going to help. The resource we are on the verge of eclipsing is Internet protocol, or IP addresses. When the internet was first put to use in the 1980's, engineers created IPv4, which has an upper limit of 4.3 billion different IP addresses. We've almost accounted for them all. According to the American Registry for Internet Numbers (ARIN), only 3.4 million IP addresses are still available from the 1.3 billion IP addresses allotted to North America.