Game Development Reference
In-Depth Information
Table 19.1 IP Address Classes
Class
Network ID Bytes
Hosts on Network
Networks on Internet
A
1
16,777,216
127
B
2
65,536
16,384
C
3
254
2,097,152
Here
'
s a quick example of some of the holders of Class A address blocks on the
Internet:
n
General Electric Company
n
Level 3 Communications
n
Army Information Systems Center
n
IBM Corporation
n
DoD Intel Information Systems, Defense Intelligence Agency
n
AT&T
n
Xerox Palo Alto Research Center
n
Hewlett-Packard Company
n
Apple Computer, Inc.
n
Massachusetts Institute of Technology
n
Ford Motor Company
n
Computer Sciences Corporation
n
U.S. Defense Information Systems Agency
n
UK Ministry of Defense
n
Halliburton
Interesting list of organizations, isn
'
t it? It
'
s a virtual who
'
s who of the military indus-
trial complex.
As you might have guessed, there
s a central authority for handing out unique net-
work ID numbers to those who want to get on the Net. This authority is called the
Internet Corporation for Assigned Names and Numbers (ICANN). Once the network
ID is assigned, it
'
s up to the local network administrator to hand out unique host
IDs. In the case of the network in my house, the unique host IDs are handed out
'
