Fritz! Fon WLAN 7390 Installation, Configuration And Operation page 181

Glossary
IP address
IP addressing
FRITZ!Box Fon WLAN 7390
In IP-based networks, for instance in the Internet and local
networks, all connected devices are addressed via their IP
addresses. So that data packets are sure to be delivered
to the right address, each IP address may be assigned on-
ly once within the Internet or a local IP network.
The IP address consists of four three-digit groups of num-
bers (for instance, 192.168.178.247). Each group of num-
bers can assume values between 000 and 255.
Every IP address contains two components: the network
address and the host address. These two components can
be read out of an IP address only if the subnet mask is al-
so specified.
IP addresses can be public or private, and also fixed or as-
signed dynamically. See the corresponding entries in the
Glossary for more information.
Addressing is one of the main functions of the Internet
Protocol (IP). Internet addresses can be written in deci-
mal, octal or hexadecimal notation. The FRITZ!Box uses
"dotted-decimal" notation: The four bytes of an address
are represented by decimal numbers separated by dots.
The total volume of Internet addresses, the address
space, is separated into classes (A, B, C, D, and E). The full
set of IP addresses, called the address space, is grouped
into address classes designated as A, B, C, D and E. Only
the first three of these five address classes are actually
used. These classes can be described as follows:
Classes Properties
Class A few networks, many hubs
address
Class B intermediate distribution of
address networks and hubs
Class C many networks, few hubs
address
181
Network Address
Decimal Value
0-127
128-191
192-223