December 2002
Intermediate to advanced
1050 pages
24h 49m
English
Content preview from J2EE™ and Beyond: Design, Develop, and Deploy World-Class Java™ Software
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TCP/IP Network Addresses
IP originally defined network addresses as 32-bit binary addresses generally represented as 3 digit decimal numbers separated by periods. Since each section or octet of the address represents an 8 bit byte, the highest number that can be placed in the octet is 255 (28 – 1).
But not all 32-bit IP addresses are available. Five different types of networks were reserved in the original scheme, referred to as Class A,B,C,D and E networks. These network classes are as listed in Table 17-2.
| Class | Range | Max. Networks in Class | Max. Hosts |
|---|---|---|---|
| A | 0.0.0.0 to 127.255.255.255 | 126 | over 16 million |
| B | 128.0.0.0 to 191.255.255.255 | 16384 | 65534 |
| C | 192.0.0.0 to 223.255.255.255 | 2097152 | 254 |
| D | 224.0.0.0 to 239.255.255.255 | <for multi-cast> ... |
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