IT Certification and Training Blog

Subnetting Demystified

Mar 7, 2013 8:37:00 AM / by Kelson Lawrence posted in Binary Math, CIDR Notation, Why Subnet?, Fast Subnetting, Subnetting Demystified, IPv4, IP Addressing, Address Classes, Subnetting How To


By John Oden

It is 2013, and the last of the unallocated IPv4 address space was handed out by the Internet Assigned Numbers Authority (IANA) several years ago. The IT industry has been contemplating the looming depletion of the IPv4 address space since the early 2000s. Back in 2003, one would have thought that by 2013, we would be well on our way with the deployment of IPv6, which would once and for all eliminate the scarcity of available global IP addresses. Except that we're not. Not well on our way with the global deployment of IPv6, that is.

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