Glossary
FRITZ!WLAN Repeater N/G 47
Public IP
Address
A public IP address is an IP address valid in the Internet.
Every computer or router participating in the Internet must
have a uniquely assigned public IP address. This address
is usually negotiated dynamically with the Internet Service
Provider when a connection to the Internet is dialed. The
Internet Service Provider assigns the negotiated IP ad-
dress to the computer or router for the duration of an Inter-
net session.
Private IP
Address
Private IP addresses are used for computers and other
network devices within local IP networks.
Since many local IP networks are not connected to the In-
ternet except via single computers or routers (gateway),
certain address ranges are excluded from the publicly
available IP addresses so that they are available for as-
signment in local IP networks. An IP address may only be
assigned once within the local network. A private IP ad-
dress may exist in any number of other local networks.
Subnetwork A local IP network can consist of one subnetwork or be di-
vided into multiple subnetworks. The division into subnet-
works is performed when the local IP network is config-
ured. The subnetworks of a local IP network are also IP
networks.
Subnet Mask The subnet mask indicates which part of an IP address is
the network address and which the address of the com-
puter. The network address defines what is called the sub-
net.
Example 1
IP address: 192.168.178.247
Subnet mask: 255.255.255.0
The assignment of the first three groups of numerals in the sub-
net mask indicates that the first three groups of numerals in the
IP address define the network. The following addresses result:
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