General Ip Information; Ip Addresses And Subnet Masks - Alcatel speed touch home Advanced User's Manual

9 Configuring IP
9.1

General IP Information

9.1.1

IP Addresses and Subnet Masks

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An IP address is a 32 bit number that uniquely identifies
a computer on your network or the Internet. This number is
commonly represented in dotted quad" format. Each octet (8 bits)
is represented as a decimal number. Dots are used as octet
separators (e.g. 10.0.0.138).
Historically, an IP address consists of two parts: a network part
and a host part. The network part identifies the network on which
a host resides. The host part identifies a particular host on a given
network. The dividing line between the network part and the host
part can be derived from the Netmask or Subnet Mask.
The 1 bits in the Subnet Mask represent the contiguous leading
bits of the IP address that has network significance.
For example, an IP address is 172.16.0.2 and the Subnet Mask is
255.255.255.0.
The binary notation of the IP address equals:
10101100.00010000.00000000.00000010.
The dotted quad notation of the Subnet Mask equals:
11111111.11111111.11111111.0000000.
Since all the 1 bits of the Subnet Mask have network significance,
the network part of the IP address would be:
10101100.00010000.00000000.00000010
AND 11111111.11111111.11111111.00000000
10101100.00010000.00000000
or thus
172.
The subnet part is the remaining part
or thus
A more up to date representation of Subnet Masks do not refer
to a Subnet Mask, but to a prefix length. The prefix number equals
the number of ones in the Subnet Mask. For example the Subnet
Mask 255.255.255.0 could also be written as the prefix /24.
For example:
IP Address 10.0.0.138
"
Net Mask 255.255.255.0
"
With the prefix method this will be written as :
prefix address 10.0.0.138/24
"
In the routing table of the Speed Touch Home this notation will
be used.
16. 0
00000010
3EC 17096 AAAA TCZZA Ed. 01
2.