Class C is an IPv4 address class identified by a first octet from 192 through 223. It uses a default /24 prefix, leaving 8 bits for hosts. section 7.3.4
Remember these exam-relevant characteristics:
- Begins with the binary pattern 110 and spans 192.0.0.0 through 223.255.255.255. section 7.3.4
- Uses a 24-bit network portion and an 8-bit host portion, providing 2,097,152 class C networks and 256 addresses per network. section 7.3.4
- Belongs to the host-assigned classes A, B, and C; unlike class D and E, it is not reserved for multicast or experimental purposes. section 7.3.4
Reading the first octet
An IPv4 address beginning with 200 falls in the Class C range, so the classful interpretation uses a /24 prefix: the first three octets identify the network and the final octet identifies the host. section 7.3.4
Table 7.2 IPv4 address classes (view table figure)
| Class |
First octet bit pattern |
First octet decimal range |
Prefix length |
Note |
|---|---|---|---|---|
| A |
0xxxxxxx |
0–127 |
/8 |
Address range: 0.0.0.0–127.255.255.255 |
| B |
10xxxxxx |
128–191 |
/16 |
Address range: 128.0.0.0–191.255.255.255 |
| C |
110xxxxx |
192–223 |
/24 |
Address range: 192.0.0.0 to 223.255.255.255 |
| D |
1110xxxx |
224–239 |
Reserved for multicast addresses |
|
| E |
1111xxxx |
240–255 |
Reserved for experimental purposes |
Compare Class C's binary pattern, decimal range, /24 prefix, and role with the other IPv4 address classes. section 7.3.4
