Add partition structure to name to enable some function to be
more efficient, typically location and name allocation
Domain Name Service (DNS) name - tsunb.ctn.cogs.susx.ac.uk.
Each part of name comes from flat name space. Division of name space
and possible objects into smaller space. "uk" reduces objects to
those within the uk, "ac" to those administered by academic
networks, and so on.
When allocating names, simply add to lowest part of partition.
Low risk of collision, since small number of other objects, all
administered by same authority
When looking up name, can guess where information will reside.
![\includegraphics[]{figs/dns}](img23.png)