prefix
Click on the red underlined text to get to the source
... IP space is
very large, for example, the network prefix required to
cover the request is of length /18 or shorter.
...
... Organizations will be assigned address space based on immediate
utilization plus 1 year projected utilization. A prefix longer than
/24 may be issued if deemed appropriate. Organizations with less
than 128 hosts ...
... hosts will not be issued an IP address directly from the
IRs. Organizations may be issued a prefix longer than /24 if the
organization can provide documentation from a registry recognized ISP ...
... ISP
indicating the ISP will accept the long prefix for injection into the
global routing system.
...
... to be assigned/allocated in classless blocks. With this in mind,
assignments will not be made in Class Cs or Bs but by prefix
length. Consequently, an organization that would have been
assigned a Class B in the past will now be assigned a /16 prefix ...
... prefix
length. Consequently, an organization that would have been
assigned a Class B in the past will now be assigned a /16 prefix,
regardless of the actual address class ...
... reduce the number of globally advertised routes. This may
include setting limits on the size of CIDR prefixes added to
the routing tables, filtering ...
... CIDR blocks of less than /16. Local
IRs/ISPs with a prefix length of /16 or shorter will be responsible
for maintaining all IN-ADDR.ARPA resource records ...