| A | B |
|---|
| Class A range | 1-126 |
| Class B range | 128-191 |
| Class C range | 192-223 |
| Class D range | 224-239 |
| Class E range | 240-254 |
| Class A default subnet mask | 255.0.0.0 |
| Class B default subnet mask | 255.255.0.0 |
| Class C default subnet mask | 255.255.255.0 |
| Class A octets | N H H H |
| Class B octets | N N H H |
| Class C octets | N N N H |
| Private A range | 10.0.0.0 to 10.255.255.255 |
| Private B range | 172.16.0.0 to 172.31.255.255 |
| Private C range | 192.168.0.0 to 192.168.255.255 |
| Number of bits in IP address | 32 |
| # of octets in an IP address | 4 |
