Classless Inter-Domain Routing
An IP address is interpreted as composed of two parts: a network-identifying prefix followed by a host identifier within that network. In the previous classful network architecture, IP address allocations were based on the bit boundaries of the four octets of an IP address. An address was considered to be the combination of an 8, 16, or 24-bit network prefix along with a 24, 16, or 8-bit host identifier respectively. Thus, the smallest allocation and routing block contained only 256 addresses—too small for most enterprises, and the next larger block contained addresses—too large to be used efficiently even by large organizations. This led to inefficiencies in address use as well as inefficiencies in routing, because it required a large number of allocated class-C networks with individual route announcements, being geographically dispersed with little opportunity for route aggregation.
Interested Parties Information
The IP Name Number is the code for a name or pseudonym related to an entity (natural person or a legal entity). One entity can have several names. Prince for example has the IPI-codes
00045620792 (Nelson Prince Rogers), 00052210040 (Prince) and 00334284961 (Nelson Prince R).
The IPI Name Number is composed of eleven numeric digits.