The normal domain name structure as a tree starting from the root. We write a normal domain name LEFT to RIGHT but the hierarchical structure is RIGHT to LEFT.
domain name = www.example.com highest node in tree is = .com next (lower) = .example next (lower) = www An IPv4 address is written as: 192.168.23.17
This IPv4 address defines a host = 17 in a Class C address range (192.168.23.x). In this case the most important part (the highest node) is on the LEFT (192) not the RIGHT. This is a tad awkward and would make it impossible to construct a sensible tree structure that could be searched in a single lifetime.