I have blogged numerous times in the past about domain name related issues that are concerns for brand owners: domaining, typosquatting, and the planned roll-out of new gTLD domains. This last issue--the expansion of the top-level domain space from a relative handful of top-level domains (like .com, .net, .org, etc.) to a world where it may be possible to put anything to the right of the dot--ostensibly promises to create an explosion in the domain space. (For the latest on that, see here.)

Except that the Internet is running out of IP ("Internet Protocol") addresses, which I read about this week at The Fairwinds Blog at DomainNameStrategy.com (linking to this article at The Economist). Every domain name is just an alias for a numerical address. But beyond domain names, pretty much every device attached to the Internet has a unique IP address, and these addresses are dished out in large chunks. There are only ("only!") 4.29 billion IP addresses, and as of yesterday, February 3, 2011, they have all been allocated by the principal distributor, the Internet Assigned Numbers Authority (IANA).