Subject: Classification Based On ClassId
Author: AllAboutIP
In response to: Format, Classification and Distribution Of IP Address
Posted on: 12/14/2005 03:35:26 AM
IP address can be classified among 5 classes, based on ClassId
...................0........8........16.......24.....31
..................+--------+--------+--------+--------+
..Class A.........|0.NetId.|...........HostId.........|
..................+--------+--------+--------+--------+
..Class B.........|10......NetId....|.....HostId......|
..................+--------+--------+--------+--------+
..Class C.........|110.........NetId.........|.HostId.|
..................+--------+--------+--------+--------+
..Class D.........|1110.......multicast address.......|
..................+--------+--------+--------+--------+
..Class E.........|11110....reserved for future use...|
..................+--------+--------+--------+--------+
In humans friendly format:
....................Lowest Address....Highest Address
------------------+-----------------+-----------------+
..Class A.........|.....0.1.0.0.....|.126.0.0.0.......|
..................+-----------------+-----------------+
..Class B.........|...128.1.0.0.....|.191.255.0.0.....|
..................+-----------------+-----------------+
..Class C.........|...192.0.1.0.....|.223.255.255.0...|
..................+-----------------+-----------------+
..Class D.........|...224.0.0.0.....|.239.255.255.255.|
..................+-----------------+-----------------+
..Class E.........|...240.0.0.0.....|.247.255.255.255.|
..................+-----------------+-----------------+
where, 127.0.0.0 is reserved for loopback and inter-process communication on the local machine; all 0s refers to network itself; and all 1s is reserved for broadcasting.
Spencer
>
> On 12/14/2005 02:59:39 AM
AllAboutIP wrote:
Conceptually, a 32-bit IP address takes the format of
ClassId | NetworkId | HostId
ClassId -- for classification of IP address;
NetworkId -- for identifying which network the IP address belongs to
HostId -- for identifying the host
Defining IP address in such a way is to extract each portion quickly.
Spencer
References:
